Ways other than sleep to restore cells/neurons












9












$begingroup$


So I have a planet with multiple species on it. My planet is tidally locked. I know it is generally thought a tidally locked planet couldn't harbor life because of the extreme temperatures, but my argument is that it is theoretically possible if the planet has a thick enough atmosphere, which helps with cooling, and if there is steady airflow from light side to dark side. This does cause very extreme weather, especially around the area where it goes from light to dark, but still, it keeps the temperatures survivable most places on the planet, except the spots closest to and furthest away from the star.



But here's my question. I am assuming on a planet like this, circadian rhythms would not have evolved since there is no day night cycle, and therefore species would not sleep, at least not in the way we do. The planet is at a tilt, and therefore some latitudes do have daylight during summer and night during winter, so in those places I can see hibernation being a thing. But otherwise, I don't think they would sleep.



So my question is what could replace sleep as a restorative process for their bodies? Entropy would still cause their cells/neurons to degenerate, and so I imagine they would still need some kind of regular, restorative process to keep them functioning. What could this be? How exactly does sleep help restore our own brains? If I understood how that works, I might be able to come up with a reasonable process to replace it.










share|improve this question











$endgroup$








  • 2




    $begingroup$
    @Soan, don't get too distracted by the OP's backstory. I'm all for a good frame challenge, but insofar as it's possible, we should accept the OP's backstory and focus on the question (lest the distraction overwhelm the comments).
    $endgroup$
    – JBH
    Feb 10 at 18:46






  • 1




    $begingroup$
    Welcome to Worldbuilding.SE, Lisa! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. Thanks!
    $endgroup$
    – JBH
    Feb 10 at 18:47






  • 1




    $begingroup$
    The coriolis effect would still impact winds. Multiple studies have concluded that on tidally locked planets, winds may help keep the dark side warm. For example: researchgate.net/publication/… and arxiv.org/abs/1001.5117 or en.wikipedia.org/wiki/… I realize of course there are other factors that make complex life evolving on such a planet very unlikely, but it doesn't seem theoretically impossible if all the right factors come together.
    $endgroup$
    – Lisa
    Feb 10 at 19:00








  • 1




    $begingroup$
    This is tough because (a) we don't really know exactly WHAT sleep does for an organism, and (b) it occurs even in Medusozoa (jellyfish), which have no brain, but become unhealthy without it.
    $endgroup$
    – pojo-guy
    Feb 10 at 22:42






  • 2




    $begingroup$
    Possible duplicate of If a species didn't sleep how else would they "recharge"?
    $endgroup$
    – Liath
    Feb 11 at 11:18
















9












$begingroup$


So I have a planet with multiple species on it. My planet is tidally locked. I know it is generally thought a tidally locked planet couldn't harbor life because of the extreme temperatures, but my argument is that it is theoretically possible if the planet has a thick enough atmosphere, which helps with cooling, and if there is steady airflow from light side to dark side. This does cause very extreme weather, especially around the area where it goes from light to dark, but still, it keeps the temperatures survivable most places on the planet, except the spots closest to and furthest away from the star.



But here's my question. I am assuming on a planet like this, circadian rhythms would not have evolved since there is no day night cycle, and therefore species would not sleep, at least not in the way we do. The planet is at a tilt, and therefore some latitudes do have daylight during summer and night during winter, so in those places I can see hibernation being a thing. But otherwise, I don't think they would sleep.



So my question is what could replace sleep as a restorative process for their bodies? Entropy would still cause their cells/neurons to degenerate, and so I imagine they would still need some kind of regular, restorative process to keep them functioning. What could this be? How exactly does sleep help restore our own brains? If I understood how that works, I might be able to come up with a reasonable process to replace it.










share|improve this question











$endgroup$








  • 2




    $begingroup$
    @Soan, don't get too distracted by the OP's backstory. I'm all for a good frame challenge, but insofar as it's possible, we should accept the OP's backstory and focus on the question (lest the distraction overwhelm the comments).
    $endgroup$
    – JBH
    Feb 10 at 18:46






  • 1




    $begingroup$
    Welcome to Worldbuilding.SE, Lisa! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. Thanks!
    $endgroup$
    – JBH
    Feb 10 at 18:47






  • 1




    $begingroup$
    The coriolis effect would still impact winds. Multiple studies have concluded that on tidally locked planets, winds may help keep the dark side warm. For example: researchgate.net/publication/… and arxiv.org/abs/1001.5117 or en.wikipedia.org/wiki/… I realize of course there are other factors that make complex life evolving on such a planet very unlikely, but it doesn't seem theoretically impossible if all the right factors come together.
    $endgroup$
    – Lisa
    Feb 10 at 19:00








  • 1




    $begingroup$
    This is tough because (a) we don't really know exactly WHAT sleep does for an organism, and (b) it occurs even in Medusozoa (jellyfish), which have no brain, but become unhealthy without it.
    $endgroup$
    – pojo-guy
    Feb 10 at 22:42






  • 2




    $begingroup$
    Possible duplicate of If a species didn't sleep how else would they "recharge"?
    $endgroup$
    – Liath
    Feb 11 at 11:18














9












9








9


1



$begingroup$


So I have a planet with multiple species on it. My planet is tidally locked. I know it is generally thought a tidally locked planet couldn't harbor life because of the extreme temperatures, but my argument is that it is theoretically possible if the planet has a thick enough atmosphere, which helps with cooling, and if there is steady airflow from light side to dark side. This does cause very extreme weather, especially around the area where it goes from light to dark, but still, it keeps the temperatures survivable most places on the planet, except the spots closest to and furthest away from the star.



But here's my question. I am assuming on a planet like this, circadian rhythms would not have evolved since there is no day night cycle, and therefore species would not sleep, at least not in the way we do. The planet is at a tilt, and therefore some latitudes do have daylight during summer and night during winter, so in those places I can see hibernation being a thing. But otherwise, I don't think they would sleep.



So my question is what could replace sleep as a restorative process for their bodies? Entropy would still cause their cells/neurons to degenerate, and so I imagine they would still need some kind of regular, restorative process to keep them functioning. What could this be? How exactly does sleep help restore our own brains? If I understood how that works, I might be able to come up with a reasonable process to replace it.










share|improve this question











$endgroup$




So I have a planet with multiple species on it. My planet is tidally locked. I know it is generally thought a tidally locked planet couldn't harbor life because of the extreme temperatures, but my argument is that it is theoretically possible if the planet has a thick enough atmosphere, which helps with cooling, and if there is steady airflow from light side to dark side. This does cause very extreme weather, especially around the area where it goes from light to dark, but still, it keeps the temperatures survivable most places on the planet, except the spots closest to and furthest away from the star.



But here's my question. I am assuming on a planet like this, circadian rhythms would not have evolved since there is no day night cycle, and therefore species would not sleep, at least not in the way we do. The planet is at a tilt, and therefore some latitudes do have daylight during summer and night during winter, so in those places I can see hibernation being a thing. But otherwise, I don't think they would sleep.



So my question is what could replace sleep as a restorative process for their bodies? Entropy would still cause their cells/neurons to degenerate, and so I imagine they would still need some kind of regular, restorative process to keep them functioning. What could this be? How exactly does sleep help restore our own brains? If I understood how that works, I might be able to come up with a reasonable process to replace it.







creature-design aliens brain day-night sleep






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Feb 10 at 23:55









Cyn

8,69311844




8,69311844










asked Feb 10 at 18:24









LisaLisa

484




484








  • 2




    $begingroup$
    @Soan, don't get too distracted by the OP's backstory. I'm all for a good frame challenge, but insofar as it's possible, we should accept the OP's backstory and focus on the question (lest the distraction overwhelm the comments).
    $endgroup$
    – JBH
    Feb 10 at 18:46






  • 1




    $begingroup$
    Welcome to Worldbuilding.SE, Lisa! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. Thanks!
    $endgroup$
    – JBH
    Feb 10 at 18:47






  • 1




    $begingroup$
    The coriolis effect would still impact winds. Multiple studies have concluded that on tidally locked planets, winds may help keep the dark side warm. For example: researchgate.net/publication/… and arxiv.org/abs/1001.5117 or en.wikipedia.org/wiki/… I realize of course there are other factors that make complex life evolving on such a planet very unlikely, but it doesn't seem theoretically impossible if all the right factors come together.
    $endgroup$
    – Lisa
    Feb 10 at 19:00








  • 1




    $begingroup$
    This is tough because (a) we don't really know exactly WHAT sleep does for an organism, and (b) it occurs even in Medusozoa (jellyfish), which have no brain, but become unhealthy without it.
    $endgroup$
    – pojo-guy
    Feb 10 at 22:42






  • 2




    $begingroup$
    Possible duplicate of If a species didn't sleep how else would they "recharge"?
    $endgroup$
    – Liath
    Feb 11 at 11:18














  • 2




    $begingroup$
    @Soan, don't get too distracted by the OP's backstory. I'm all for a good frame challenge, but insofar as it's possible, we should accept the OP's backstory and focus on the question (lest the distraction overwhelm the comments).
    $endgroup$
    – JBH
    Feb 10 at 18:46






  • 1




    $begingroup$
    Welcome to Worldbuilding.SE, Lisa! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. Thanks!
    $endgroup$
    – JBH
    Feb 10 at 18:47






  • 1




    $begingroup$
    The coriolis effect would still impact winds. Multiple studies have concluded that on tidally locked planets, winds may help keep the dark side warm. For example: researchgate.net/publication/… and arxiv.org/abs/1001.5117 or en.wikipedia.org/wiki/… I realize of course there are other factors that make complex life evolving on such a planet very unlikely, but it doesn't seem theoretically impossible if all the right factors come together.
    $endgroup$
    – Lisa
    Feb 10 at 19:00








  • 1




    $begingroup$
    This is tough because (a) we don't really know exactly WHAT sleep does for an organism, and (b) it occurs even in Medusozoa (jellyfish), which have no brain, but become unhealthy without it.
    $endgroup$
    – pojo-guy
    Feb 10 at 22:42






  • 2




    $begingroup$
    Possible duplicate of If a species didn't sleep how else would they "recharge"?
    $endgroup$
    – Liath
    Feb 11 at 11:18








2




2




$begingroup$
@Soan, don't get too distracted by the OP's backstory. I'm all for a good frame challenge, but insofar as it's possible, we should accept the OP's backstory and focus on the question (lest the distraction overwhelm the comments).
$endgroup$
– JBH
Feb 10 at 18:46




$begingroup$
@Soan, don't get too distracted by the OP's backstory. I'm all for a good frame challenge, but insofar as it's possible, we should accept the OP's backstory and focus on the question (lest the distraction overwhelm the comments).
$endgroup$
– JBH
Feb 10 at 18:46




1




1




$begingroup$
Welcome to Worldbuilding.SE, Lisa! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. Thanks!
$endgroup$
– JBH
Feb 10 at 18:47




$begingroup$
Welcome to Worldbuilding.SE, Lisa! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. Thanks!
$endgroup$
– JBH
Feb 10 at 18:47




1




1




$begingroup$
The coriolis effect would still impact winds. Multiple studies have concluded that on tidally locked planets, winds may help keep the dark side warm. For example: researchgate.net/publication/… and arxiv.org/abs/1001.5117 or en.wikipedia.org/wiki/… I realize of course there are other factors that make complex life evolving on such a planet very unlikely, but it doesn't seem theoretically impossible if all the right factors come together.
$endgroup$
– Lisa
Feb 10 at 19:00






$begingroup$
The coriolis effect would still impact winds. Multiple studies have concluded that on tidally locked planets, winds may help keep the dark side warm. For example: researchgate.net/publication/… and arxiv.org/abs/1001.5117 or en.wikipedia.org/wiki/… I realize of course there are other factors that make complex life evolving on such a planet very unlikely, but it doesn't seem theoretically impossible if all the right factors come together.
$endgroup$
– Lisa
Feb 10 at 19:00






1




1




$begingroup$
This is tough because (a) we don't really know exactly WHAT sleep does for an organism, and (b) it occurs even in Medusozoa (jellyfish), which have no brain, but become unhealthy without it.
$endgroup$
– pojo-guy
Feb 10 at 22:42




$begingroup$
This is tough because (a) we don't really know exactly WHAT sleep does for an organism, and (b) it occurs even in Medusozoa (jellyfish), which have no brain, but become unhealthy without it.
$endgroup$
– pojo-guy
Feb 10 at 22:42




2




2




$begingroup$
Possible duplicate of If a species didn't sleep how else would they "recharge"?
$endgroup$
– Liath
Feb 11 at 11:18




$begingroup$
Possible duplicate of If a species didn't sleep how else would they "recharge"?
$endgroup$
– Liath
Feb 11 at 11:18










4 Answers
4






active

oldest

votes


















5












$begingroup$


So my question is what could replace sleep as a restorative process for their bodies? Entropy would still cause their cells/neurons to degenerate, and so I imagine they would still need some kind of regular, restorative process to keep them functioning.




The thing is, we don't actually know that sleep does this for us. It's a popular theory, but we don't actually know. "Restoring neurons" sounds great, but no one has shown that that's what sleep does. There's research about strengthening connections and cleaning away waste, but, again, none of it is really conclusive.



Check this out:




Sleep scientist William Dement, who co-discovered REM sleep and helped found the Stanford Center for Sleep Sciences and Medicine, said in 2010, after more than 50 years studying sleep, that: "As far as we know, the only reason we need to sleep that is really, really solid is because we get sleepy." Sleep is one of the greatest mysteries in biology. We have no idea why we need to sleep, or why it's so debilitating if we don't. Lots of hypotheses, but no conclusive answer just yet.




We definitely know that humans and other mammals need sleep to live, so something is going on. So, eh, maybe creatures in your world sleep, maybe in a pattern unrelated to a day/night cycle. Or maybe they just have other brain structures that do ... whatever things sleep actually does ... on a continual basis.






share|improve this answer











$endgroup$





















    9












    $begingroup$

    Die, and be reborn.



    In general, if you have stuff, you can maintain what you have. Or you can throw it out when it is worn and get new. Our bodies do both. Epithelial cells (like skin) fulfills its task and then dies and is sloughed. Blood cells live their lives and then die and are recycled.



    Neurons are not recycled. They are long lived, and so are maintained. Presumably sleep is part of this maintenance. But there is no particular reason for them not to die and be replaced like other cells in the body. The dying neuron would hand off its information to its replacement before it died. Your organisms could do this periodically, like a snake shedding its skin. The in-between period offers narrative potential.



    Re the bigger questions of sleep - interesting for a fiction but these big, unresolved questions. There is a question of memory - how it is stored and where. Is sleep necessary for such things? Why do we sleep? Why does every animal sleep? Would it not be evolutionarily advantageous to not have to sleep? These are open questions and the subject of ongoing research. You could riff off of these for your world - your Sleepless Ones might have advantages and disadvantages compared to sleepy Earth creatures.





    Half sleep.



    Dolphins sleep one half of the brain at a time. The other half tends to basic functions, like going up to get air,



    https://www.livescience.com/44822-how-do-dolphins-sleep.html




    Instead, these animals undergo an unusual form of sleep called
    "unihemispheric slow-wave sleep." Also known as deep sleep, slow-wave
    sleep is a type of sleep thought to help the brain consolidate new
    memories and recover from its daily activities.



    When it's time to rest, a dolphin will shut down only one hemisphere
    of its brain, and close the opposite eye (the left eye will be closed
    when the right half of the brain sleeps, and vice versa). During this
    time, the other half of the brain monitors what's going in the
    environment and controls breathing functions.




    In your world of perpetual day, if you want to have some kind of sleep you could adapt something like this. It would make for an interesting story to think about a human that slept like this - maybe your aliens are of human stock originally and have evolved to sleep like dolphins. A creature in half sleep would be somewhat less than it was when completely awake. Its manner might depend on which half was asleep and which half was awake.






    share|improve this answer









    $endgroup$









    • 3




      $begingroup$
      dolphins in torpor are sluggish like an extremely drunk or tired person, and are incapable of complicated tasks. They basically have enough awareness to swim slowly, regulate breathing, and recognize some of danger (like storms) at which point they wake up. the downside of course is it take more than twice as long as normal sleep.
      $endgroup$
      – John
      Feb 10 at 21:58





















    8












    $begingroup$

    My cat sleeps all the time...



    I'm going to advocate that sleep need not be lost in your circumstances. The Circadian rhythm is convenient, but I'm not convinced my cat knows what it is. Or, perhaps, our Latin brothers and sisters, who enjoy siesta.



    Rest can come at any time, whether through sleep or meditation.



    However, as I think about it, it's not necessarily true that the Circadian rhythm doesn't exist on your planet, either. It's an assumption that it exists because of the day/night cycle. But it's just as likely that life accommodated the day/night cycle. In other words, it's easily believed that a periodic cycle exists with your creatures despite no day/night cycle.



    Even on a tidally-locked planet, there are cycles



    Life on a tidally-locked planet must have cycles. Things are born, grow old, and die. Energy is put into flowering, then fruit, then restoring. You run from the dragon until you get tired and are forced to stop and rest. Well... and then you die a gruesome death... but that's actually important.



    Darkness cometh from palm fronds



    I can easily imagine that part of the development of Earth's Circadian rythym came from the need for protection. You get tired, and not wanting to be et by the dragon, you find someplace well protected... out of sight... dark, where the dragon can't find you. (That you need protection regularly at night simply reinforces the rhythm.) A lot of the "rhythm" of your planet (and perhaps any planet) would come from the predator-prey fight/hide-for-your-life behavior.



    Which brings us to palm fronds. Dragons are tall and, looking down, they can't see you sleeping beneath the fronds where you found a comfy place to sleep of the chase.



    Conclusion




    • Rhythms are going to happen for many reasons, the lack of a day/night cycle wouldn't stop that.


    • The need for protection would naturally create an artificial "night" due to the need to hide from predators. Burrows in the ground and palm fronds leading to buildings via the dawn of intellect.


    • Like my cat, one can rest at any time. Eat a big turkey meal and see how easy it is to fall asleep.


    • Therefore, I don't think you'd need to replace sleep at all.







    share|improve this answer









    $endgroup$













    • $begingroup$
      Hmm, I don't fully agree. The ancestral genes which gave rise to the circadian clocks today evolved over 1 billion years ago, when there was no hiding in darkness or recognizable predator/prey relations. The gene coincides with day/night. So on my planet we would not have evolved this gene in the first place. We might hide in darkness, but darkness wouldn't evoke the desire to sleep. That said, you're right that my planet will have plenty of other cycles which may be the root of their own rest/activity cycle of some kind. I will have to think about what cycles will work for this. Thanks!
      $endgroup$
      – Lisa
      Feb 10 at 19:33










    • $begingroup$
      This is a good answer sleep is not caused by circadian rhythms, Circadian rhythms are a just a convenient way to regulate it in some animals. Sleep is just a requirement of how brains work, especially large complex brains. Even animals that live in total darkness sleep, and many animals sleep during the day or irregardless of day/night cycles.
      $endgroup$
      – John
      Feb 10 at 22:02












    • $begingroup$
      Even creatures without brains (medusozoans) sleep, so it's clearly coded in the genome even before brains.
      $endgroup$
      – pojo-guy
      Feb 10 at 23:20










    • $begingroup$
      @pojo-guy, Jellyfish sleep? I had no idea. Cheers!
      $endgroup$
      – JBH
      Feb 10 at 23:22






    • 1




      $begingroup$
      sciencemag.org/news/2017/09/…
      $endgroup$
      – pojo-guy
      Feb 10 at 23:56



















    5












    $begingroup$

    Circadian rhythms regulate the timing of sleep. They do not create the need for it.



    A body in an area without day-night cycles would still require sleep. People and animals who lived in Arctic regions before artificial light still slept in the height of summer or winter, as well as year-round, despite drastic changes in the amount of sun each day.



    People who are completely blind (with zero awareness of light or who simply don't have eyes) still sleep and need to sleep (they're not just doing it for cultural reasons). But they often don't have 24-hour rhythms and may have disorders that stem from that.



    One of the most important things we need sleep for is the generation of Growth Hormone. GH is released primarily during sleep. It, and its downstream products such as IGF-1, regulate insulin use in the body, strength bones, produce breastmilk in lactating women, help with detoxification pathways, and dozens of other things.



    GH also rebuilds muscle. If you're familiar with the rule for weightlifting that you only work out a set of muscles every other day or less, this is why. Exercise breaks down your muscles and restorative sleep releases GH that builds your muscles back up (bigger and stronger in many cases, but also what you need to maintain strength).



    The myth is that only growing children need GH. The reality is that everyone needs it (not too much of it, but just the right amounts). Adults with GH deficiency (which can be a holdover from childhood or it can be adult-onset) are often tired and weak because their muscles aren't getting built back up after everyday activity like they should.



    While other activities can release GH from the pituitary, deep sleep is really what you need to do it right. All humans need sleep and this is a large reason why.



    Other reasons for sleep include: a full relaxation of the voluntary muscles (very hard to do without being asleep, though not impossible) and dreaming. The brain differences in various stages of sleep and dreaming are important. They affect both our physical health and our mental health.



    To replace sleep, you would still need a cyclical restorative process.






    share|improve this answer









    $endgroup$













      Your Answer





      StackExchange.ifUsing("editor", function () {
      return StackExchange.using("mathjaxEditing", function () {
      StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
      StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
      });
      });
      }, "mathjax-editing");

      StackExchange.ready(function() {
      var channelOptions = {
      tags: "".split(" "),
      id: "579"
      };
      initTagRenderer("".split(" "), "".split(" "), channelOptions);

      StackExchange.using("externalEditor", function() {
      // Have to fire editor after snippets, if snippets enabled
      if (StackExchange.settings.snippets.snippetsEnabled) {
      StackExchange.using("snippets", function() {
      createEditor();
      });
      }
      else {
      createEditor();
      }
      });

      function createEditor() {
      StackExchange.prepareEditor({
      heartbeatType: 'answer',
      autoActivateHeartbeat: false,
      convertImagesToLinks: false,
      noModals: true,
      showLowRepImageUploadWarning: true,
      reputationToPostImages: null,
      bindNavPrevention: true,
      postfix: "",
      imageUploader: {
      brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
      contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
      allowUrls: true
      },
      noCode: true, onDemand: true,
      discardSelector: ".discard-answer"
      ,immediatelyShowMarkdownHelp:true
      });


      }
      });














      draft saved

      draft discarded


















      StackExchange.ready(
      function () {
      StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fworldbuilding.stackexchange.com%2fquestions%2f138854%2fways-other-than-sleep-to-restore-cells-neurons%23new-answer', 'question_page');
      }
      );

      Post as a guest















      Required, but never shown

























      4 Answers
      4






      active

      oldest

      votes








      4 Answers
      4






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      5












      $begingroup$


      So my question is what could replace sleep as a restorative process for their bodies? Entropy would still cause their cells/neurons to degenerate, and so I imagine they would still need some kind of regular, restorative process to keep them functioning.




      The thing is, we don't actually know that sleep does this for us. It's a popular theory, but we don't actually know. "Restoring neurons" sounds great, but no one has shown that that's what sleep does. There's research about strengthening connections and cleaning away waste, but, again, none of it is really conclusive.



      Check this out:




      Sleep scientist William Dement, who co-discovered REM sleep and helped found the Stanford Center for Sleep Sciences and Medicine, said in 2010, after more than 50 years studying sleep, that: "As far as we know, the only reason we need to sleep that is really, really solid is because we get sleepy." Sleep is one of the greatest mysteries in biology. We have no idea why we need to sleep, or why it's so debilitating if we don't. Lots of hypotheses, but no conclusive answer just yet.




      We definitely know that humans and other mammals need sleep to live, so something is going on. So, eh, maybe creatures in your world sleep, maybe in a pattern unrelated to a day/night cycle. Or maybe they just have other brain structures that do ... whatever things sleep actually does ... on a continual basis.






      share|improve this answer











      $endgroup$


















        5












        $begingroup$


        So my question is what could replace sleep as a restorative process for their bodies? Entropy would still cause their cells/neurons to degenerate, and so I imagine they would still need some kind of regular, restorative process to keep them functioning.




        The thing is, we don't actually know that sleep does this for us. It's a popular theory, but we don't actually know. "Restoring neurons" sounds great, but no one has shown that that's what sleep does. There's research about strengthening connections and cleaning away waste, but, again, none of it is really conclusive.



        Check this out:




        Sleep scientist William Dement, who co-discovered REM sleep and helped found the Stanford Center for Sleep Sciences and Medicine, said in 2010, after more than 50 years studying sleep, that: "As far as we know, the only reason we need to sleep that is really, really solid is because we get sleepy." Sleep is one of the greatest mysteries in biology. We have no idea why we need to sleep, or why it's so debilitating if we don't. Lots of hypotheses, but no conclusive answer just yet.




        We definitely know that humans and other mammals need sleep to live, so something is going on. So, eh, maybe creatures in your world sleep, maybe in a pattern unrelated to a day/night cycle. Or maybe they just have other brain structures that do ... whatever things sleep actually does ... on a continual basis.






        share|improve this answer











        $endgroup$
















          5












          5








          5





          $begingroup$


          So my question is what could replace sleep as a restorative process for their bodies? Entropy would still cause their cells/neurons to degenerate, and so I imagine they would still need some kind of regular, restorative process to keep them functioning.




          The thing is, we don't actually know that sleep does this for us. It's a popular theory, but we don't actually know. "Restoring neurons" sounds great, but no one has shown that that's what sleep does. There's research about strengthening connections and cleaning away waste, but, again, none of it is really conclusive.



          Check this out:




          Sleep scientist William Dement, who co-discovered REM sleep and helped found the Stanford Center for Sleep Sciences and Medicine, said in 2010, after more than 50 years studying sleep, that: "As far as we know, the only reason we need to sleep that is really, really solid is because we get sleepy." Sleep is one of the greatest mysteries in biology. We have no idea why we need to sleep, or why it's so debilitating if we don't. Lots of hypotheses, but no conclusive answer just yet.




          We definitely know that humans and other mammals need sleep to live, so something is going on. So, eh, maybe creatures in your world sleep, maybe in a pattern unrelated to a day/night cycle. Or maybe they just have other brain structures that do ... whatever things sleep actually does ... on a continual basis.






          share|improve this answer











          $endgroup$




          So my question is what could replace sleep as a restorative process for their bodies? Entropy would still cause their cells/neurons to degenerate, and so I imagine they would still need some kind of regular, restorative process to keep them functioning.




          The thing is, we don't actually know that sleep does this for us. It's a popular theory, but we don't actually know. "Restoring neurons" sounds great, but no one has shown that that's what sleep does. There's research about strengthening connections and cleaning away waste, but, again, none of it is really conclusive.



          Check this out:




          Sleep scientist William Dement, who co-discovered REM sleep and helped found the Stanford Center for Sleep Sciences and Medicine, said in 2010, after more than 50 years studying sleep, that: "As far as we know, the only reason we need to sleep that is really, really solid is because we get sleepy." Sleep is one of the greatest mysteries in biology. We have no idea why we need to sleep, or why it's so debilitating if we don't. Lots of hypotheses, but no conclusive answer just yet.




          We definitely know that humans and other mammals need sleep to live, so something is going on. So, eh, maybe creatures in your world sleep, maybe in a pattern unrelated to a day/night cycle. Or maybe they just have other brain structures that do ... whatever things sleep actually does ... on a continual basis.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Feb 11 at 3:58

























          answered Feb 11 at 1:46









          mattdmmattdm

          756713




          756713























              9












              $begingroup$

              Die, and be reborn.



              In general, if you have stuff, you can maintain what you have. Or you can throw it out when it is worn and get new. Our bodies do both. Epithelial cells (like skin) fulfills its task and then dies and is sloughed. Blood cells live their lives and then die and are recycled.



              Neurons are not recycled. They are long lived, and so are maintained. Presumably sleep is part of this maintenance. But there is no particular reason for them not to die and be replaced like other cells in the body. The dying neuron would hand off its information to its replacement before it died. Your organisms could do this periodically, like a snake shedding its skin. The in-between period offers narrative potential.



              Re the bigger questions of sleep - interesting for a fiction but these big, unresolved questions. There is a question of memory - how it is stored and where. Is sleep necessary for such things? Why do we sleep? Why does every animal sleep? Would it not be evolutionarily advantageous to not have to sleep? These are open questions and the subject of ongoing research. You could riff off of these for your world - your Sleepless Ones might have advantages and disadvantages compared to sleepy Earth creatures.





              Half sleep.



              Dolphins sleep one half of the brain at a time. The other half tends to basic functions, like going up to get air,



              https://www.livescience.com/44822-how-do-dolphins-sleep.html




              Instead, these animals undergo an unusual form of sleep called
              "unihemispheric slow-wave sleep." Also known as deep sleep, slow-wave
              sleep is a type of sleep thought to help the brain consolidate new
              memories and recover from its daily activities.



              When it's time to rest, a dolphin will shut down only one hemisphere
              of its brain, and close the opposite eye (the left eye will be closed
              when the right half of the brain sleeps, and vice versa). During this
              time, the other half of the brain monitors what's going in the
              environment and controls breathing functions.




              In your world of perpetual day, if you want to have some kind of sleep you could adapt something like this. It would make for an interesting story to think about a human that slept like this - maybe your aliens are of human stock originally and have evolved to sleep like dolphins. A creature in half sleep would be somewhat less than it was when completely awake. Its manner might depend on which half was asleep and which half was awake.






              share|improve this answer









              $endgroup$









              • 3




                $begingroup$
                dolphins in torpor are sluggish like an extremely drunk or tired person, and are incapable of complicated tasks. They basically have enough awareness to swim slowly, regulate breathing, and recognize some of danger (like storms) at which point they wake up. the downside of course is it take more than twice as long as normal sleep.
                $endgroup$
                – John
                Feb 10 at 21:58


















              9












              $begingroup$

              Die, and be reborn.



              In general, if you have stuff, you can maintain what you have. Or you can throw it out when it is worn and get new. Our bodies do both. Epithelial cells (like skin) fulfills its task and then dies and is sloughed. Blood cells live their lives and then die and are recycled.



              Neurons are not recycled. They are long lived, and so are maintained. Presumably sleep is part of this maintenance. But there is no particular reason for them not to die and be replaced like other cells in the body. The dying neuron would hand off its information to its replacement before it died. Your organisms could do this periodically, like a snake shedding its skin. The in-between period offers narrative potential.



              Re the bigger questions of sleep - interesting for a fiction but these big, unresolved questions. There is a question of memory - how it is stored and where. Is sleep necessary for such things? Why do we sleep? Why does every animal sleep? Would it not be evolutionarily advantageous to not have to sleep? These are open questions and the subject of ongoing research. You could riff off of these for your world - your Sleepless Ones might have advantages and disadvantages compared to sleepy Earth creatures.





              Half sleep.



              Dolphins sleep one half of the brain at a time. The other half tends to basic functions, like going up to get air,



              https://www.livescience.com/44822-how-do-dolphins-sleep.html




              Instead, these animals undergo an unusual form of sleep called
              "unihemispheric slow-wave sleep." Also known as deep sleep, slow-wave
              sleep is a type of sleep thought to help the brain consolidate new
              memories and recover from its daily activities.



              When it's time to rest, a dolphin will shut down only one hemisphere
              of its brain, and close the opposite eye (the left eye will be closed
              when the right half of the brain sleeps, and vice versa). During this
              time, the other half of the brain monitors what's going in the
              environment and controls breathing functions.




              In your world of perpetual day, if you want to have some kind of sleep you could adapt something like this. It would make for an interesting story to think about a human that slept like this - maybe your aliens are of human stock originally and have evolved to sleep like dolphins. A creature in half sleep would be somewhat less than it was when completely awake. Its manner might depend on which half was asleep and which half was awake.






              share|improve this answer









              $endgroup$









              • 3




                $begingroup$
                dolphins in torpor are sluggish like an extremely drunk or tired person, and are incapable of complicated tasks. They basically have enough awareness to swim slowly, regulate breathing, and recognize some of danger (like storms) at which point they wake up. the downside of course is it take more than twice as long as normal sleep.
                $endgroup$
                – John
                Feb 10 at 21:58
















              9












              9








              9





              $begingroup$

              Die, and be reborn.



              In general, if you have stuff, you can maintain what you have. Or you can throw it out when it is worn and get new. Our bodies do both. Epithelial cells (like skin) fulfills its task and then dies and is sloughed. Blood cells live their lives and then die and are recycled.



              Neurons are not recycled. They are long lived, and so are maintained. Presumably sleep is part of this maintenance. But there is no particular reason for them not to die and be replaced like other cells in the body. The dying neuron would hand off its information to its replacement before it died. Your organisms could do this periodically, like a snake shedding its skin. The in-between period offers narrative potential.



              Re the bigger questions of sleep - interesting for a fiction but these big, unresolved questions. There is a question of memory - how it is stored and where. Is sleep necessary for such things? Why do we sleep? Why does every animal sleep? Would it not be evolutionarily advantageous to not have to sleep? These are open questions and the subject of ongoing research. You could riff off of these for your world - your Sleepless Ones might have advantages and disadvantages compared to sleepy Earth creatures.





              Half sleep.



              Dolphins sleep one half of the brain at a time. The other half tends to basic functions, like going up to get air,



              https://www.livescience.com/44822-how-do-dolphins-sleep.html




              Instead, these animals undergo an unusual form of sleep called
              "unihemispheric slow-wave sleep." Also known as deep sleep, slow-wave
              sleep is a type of sleep thought to help the brain consolidate new
              memories and recover from its daily activities.



              When it's time to rest, a dolphin will shut down only one hemisphere
              of its brain, and close the opposite eye (the left eye will be closed
              when the right half of the brain sleeps, and vice versa). During this
              time, the other half of the brain monitors what's going in the
              environment and controls breathing functions.




              In your world of perpetual day, if you want to have some kind of sleep you could adapt something like this. It would make for an interesting story to think about a human that slept like this - maybe your aliens are of human stock originally and have evolved to sleep like dolphins. A creature in half sleep would be somewhat less than it was when completely awake. Its manner might depend on which half was asleep and which half was awake.






              share|improve this answer









              $endgroup$



              Die, and be reborn.



              In general, if you have stuff, you can maintain what you have. Or you can throw it out when it is worn and get new. Our bodies do both. Epithelial cells (like skin) fulfills its task and then dies and is sloughed. Blood cells live their lives and then die and are recycled.



              Neurons are not recycled. They are long lived, and so are maintained. Presumably sleep is part of this maintenance. But there is no particular reason for them not to die and be replaced like other cells in the body. The dying neuron would hand off its information to its replacement before it died. Your organisms could do this periodically, like a snake shedding its skin. The in-between period offers narrative potential.



              Re the bigger questions of sleep - interesting for a fiction but these big, unresolved questions. There is a question of memory - how it is stored and where. Is sleep necessary for such things? Why do we sleep? Why does every animal sleep? Would it not be evolutionarily advantageous to not have to sleep? These are open questions and the subject of ongoing research. You could riff off of these for your world - your Sleepless Ones might have advantages and disadvantages compared to sleepy Earth creatures.





              Half sleep.



              Dolphins sleep one half of the brain at a time. The other half tends to basic functions, like going up to get air,



              https://www.livescience.com/44822-how-do-dolphins-sleep.html




              Instead, these animals undergo an unusual form of sleep called
              "unihemispheric slow-wave sleep." Also known as deep sleep, slow-wave
              sleep is a type of sleep thought to help the brain consolidate new
              memories and recover from its daily activities.



              When it's time to rest, a dolphin will shut down only one hemisphere
              of its brain, and close the opposite eye (the left eye will be closed
              when the right half of the brain sleeps, and vice versa). During this
              time, the other half of the brain monitors what's going in the
              environment and controls breathing functions.




              In your world of perpetual day, if you want to have some kind of sleep you could adapt something like this. It would make for an interesting story to think about a human that slept like this - maybe your aliens are of human stock originally and have evolved to sleep like dolphins. A creature in half sleep would be somewhat less than it was when completely awake. Its manner might depend on which half was asleep and which half was awake.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered Feb 10 at 20:26









              WillkWillk

              108k26204452




              108k26204452








              • 3




                $begingroup$
                dolphins in torpor are sluggish like an extremely drunk or tired person, and are incapable of complicated tasks. They basically have enough awareness to swim slowly, regulate breathing, and recognize some of danger (like storms) at which point they wake up. the downside of course is it take more than twice as long as normal sleep.
                $endgroup$
                – John
                Feb 10 at 21:58
















              • 3




                $begingroup$
                dolphins in torpor are sluggish like an extremely drunk or tired person, and are incapable of complicated tasks. They basically have enough awareness to swim slowly, regulate breathing, and recognize some of danger (like storms) at which point they wake up. the downside of course is it take more than twice as long as normal sleep.
                $endgroup$
                – John
                Feb 10 at 21:58










              3




              3




              $begingroup$
              dolphins in torpor are sluggish like an extremely drunk or tired person, and are incapable of complicated tasks. They basically have enough awareness to swim slowly, regulate breathing, and recognize some of danger (like storms) at which point they wake up. the downside of course is it take more than twice as long as normal sleep.
              $endgroup$
              – John
              Feb 10 at 21:58






              $begingroup$
              dolphins in torpor are sluggish like an extremely drunk or tired person, and are incapable of complicated tasks. They basically have enough awareness to swim slowly, regulate breathing, and recognize some of danger (like storms) at which point they wake up. the downside of course is it take more than twice as long as normal sleep.
              $endgroup$
              – John
              Feb 10 at 21:58













              8












              $begingroup$

              My cat sleeps all the time...



              I'm going to advocate that sleep need not be lost in your circumstances. The Circadian rhythm is convenient, but I'm not convinced my cat knows what it is. Or, perhaps, our Latin brothers and sisters, who enjoy siesta.



              Rest can come at any time, whether through sleep or meditation.



              However, as I think about it, it's not necessarily true that the Circadian rhythm doesn't exist on your planet, either. It's an assumption that it exists because of the day/night cycle. But it's just as likely that life accommodated the day/night cycle. In other words, it's easily believed that a periodic cycle exists with your creatures despite no day/night cycle.



              Even on a tidally-locked planet, there are cycles



              Life on a tidally-locked planet must have cycles. Things are born, grow old, and die. Energy is put into flowering, then fruit, then restoring. You run from the dragon until you get tired and are forced to stop and rest. Well... and then you die a gruesome death... but that's actually important.



              Darkness cometh from palm fronds



              I can easily imagine that part of the development of Earth's Circadian rythym came from the need for protection. You get tired, and not wanting to be et by the dragon, you find someplace well protected... out of sight... dark, where the dragon can't find you. (That you need protection regularly at night simply reinforces the rhythm.) A lot of the "rhythm" of your planet (and perhaps any planet) would come from the predator-prey fight/hide-for-your-life behavior.



              Which brings us to palm fronds. Dragons are tall and, looking down, they can't see you sleeping beneath the fronds where you found a comfy place to sleep of the chase.



              Conclusion




              • Rhythms are going to happen for many reasons, the lack of a day/night cycle wouldn't stop that.


              • The need for protection would naturally create an artificial "night" due to the need to hide from predators. Burrows in the ground and palm fronds leading to buildings via the dawn of intellect.


              • Like my cat, one can rest at any time. Eat a big turkey meal and see how easy it is to fall asleep.


              • Therefore, I don't think you'd need to replace sleep at all.







              share|improve this answer









              $endgroup$













              • $begingroup$
                Hmm, I don't fully agree. The ancestral genes which gave rise to the circadian clocks today evolved over 1 billion years ago, when there was no hiding in darkness or recognizable predator/prey relations. The gene coincides with day/night. So on my planet we would not have evolved this gene in the first place. We might hide in darkness, but darkness wouldn't evoke the desire to sleep. That said, you're right that my planet will have plenty of other cycles which may be the root of their own rest/activity cycle of some kind. I will have to think about what cycles will work for this. Thanks!
                $endgroup$
                – Lisa
                Feb 10 at 19:33










              • $begingroup$
                This is a good answer sleep is not caused by circadian rhythms, Circadian rhythms are a just a convenient way to regulate it in some animals. Sleep is just a requirement of how brains work, especially large complex brains. Even animals that live in total darkness sleep, and many animals sleep during the day or irregardless of day/night cycles.
                $endgroup$
                – John
                Feb 10 at 22:02












              • $begingroup$
                Even creatures without brains (medusozoans) sleep, so it's clearly coded in the genome even before brains.
                $endgroup$
                – pojo-guy
                Feb 10 at 23:20










              • $begingroup$
                @pojo-guy, Jellyfish sleep? I had no idea. Cheers!
                $endgroup$
                – JBH
                Feb 10 at 23:22






              • 1




                $begingroup$
                sciencemag.org/news/2017/09/…
                $endgroup$
                – pojo-guy
                Feb 10 at 23:56
















              8












              $begingroup$

              My cat sleeps all the time...



              I'm going to advocate that sleep need not be lost in your circumstances. The Circadian rhythm is convenient, but I'm not convinced my cat knows what it is. Or, perhaps, our Latin brothers and sisters, who enjoy siesta.



              Rest can come at any time, whether through sleep or meditation.



              However, as I think about it, it's not necessarily true that the Circadian rhythm doesn't exist on your planet, either. It's an assumption that it exists because of the day/night cycle. But it's just as likely that life accommodated the day/night cycle. In other words, it's easily believed that a periodic cycle exists with your creatures despite no day/night cycle.



              Even on a tidally-locked planet, there are cycles



              Life on a tidally-locked planet must have cycles. Things are born, grow old, and die. Energy is put into flowering, then fruit, then restoring. You run from the dragon until you get tired and are forced to stop and rest. Well... and then you die a gruesome death... but that's actually important.



              Darkness cometh from palm fronds



              I can easily imagine that part of the development of Earth's Circadian rythym came from the need for protection. You get tired, and not wanting to be et by the dragon, you find someplace well protected... out of sight... dark, where the dragon can't find you. (That you need protection regularly at night simply reinforces the rhythm.) A lot of the "rhythm" of your planet (and perhaps any planet) would come from the predator-prey fight/hide-for-your-life behavior.



              Which brings us to palm fronds. Dragons are tall and, looking down, they can't see you sleeping beneath the fronds where you found a comfy place to sleep of the chase.



              Conclusion




              • Rhythms are going to happen for many reasons, the lack of a day/night cycle wouldn't stop that.


              • The need for protection would naturally create an artificial "night" due to the need to hide from predators. Burrows in the ground and palm fronds leading to buildings via the dawn of intellect.


              • Like my cat, one can rest at any time. Eat a big turkey meal and see how easy it is to fall asleep.


              • Therefore, I don't think you'd need to replace sleep at all.







              share|improve this answer









              $endgroup$













              • $begingroup$
                Hmm, I don't fully agree. The ancestral genes which gave rise to the circadian clocks today evolved over 1 billion years ago, when there was no hiding in darkness or recognizable predator/prey relations. The gene coincides with day/night. So on my planet we would not have evolved this gene in the first place. We might hide in darkness, but darkness wouldn't evoke the desire to sleep. That said, you're right that my planet will have plenty of other cycles which may be the root of their own rest/activity cycle of some kind. I will have to think about what cycles will work for this. Thanks!
                $endgroup$
                – Lisa
                Feb 10 at 19:33










              • $begingroup$
                This is a good answer sleep is not caused by circadian rhythms, Circadian rhythms are a just a convenient way to regulate it in some animals. Sleep is just a requirement of how brains work, especially large complex brains. Even animals that live in total darkness sleep, and many animals sleep during the day or irregardless of day/night cycles.
                $endgroup$
                – John
                Feb 10 at 22:02












              • $begingroup$
                Even creatures without brains (medusozoans) sleep, so it's clearly coded in the genome even before brains.
                $endgroup$
                – pojo-guy
                Feb 10 at 23:20










              • $begingroup$
                @pojo-guy, Jellyfish sleep? I had no idea. Cheers!
                $endgroup$
                – JBH
                Feb 10 at 23:22






              • 1




                $begingroup$
                sciencemag.org/news/2017/09/…
                $endgroup$
                – pojo-guy
                Feb 10 at 23:56














              8












              8








              8





              $begingroup$

              My cat sleeps all the time...



              I'm going to advocate that sleep need not be lost in your circumstances. The Circadian rhythm is convenient, but I'm not convinced my cat knows what it is. Or, perhaps, our Latin brothers and sisters, who enjoy siesta.



              Rest can come at any time, whether through sleep or meditation.



              However, as I think about it, it's not necessarily true that the Circadian rhythm doesn't exist on your planet, either. It's an assumption that it exists because of the day/night cycle. But it's just as likely that life accommodated the day/night cycle. In other words, it's easily believed that a periodic cycle exists with your creatures despite no day/night cycle.



              Even on a tidally-locked planet, there are cycles



              Life on a tidally-locked planet must have cycles. Things are born, grow old, and die. Energy is put into flowering, then fruit, then restoring. You run from the dragon until you get tired and are forced to stop and rest. Well... and then you die a gruesome death... but that's actually important.



              Darkness cometh from palm fronds



              I can easily imagine that part of the development of Earth's Circadian rythym came from the need for protection. You get tired, and not wanting to be et by the dragon, you find someplace well protected... out of sight... dark, where the dragon can't find you. (That you need protection regularly at night simply reinforces the rhythm.) A lot of the "rhythm" of your planet (and perhaps any planet) would come from the predator-prey fight/hide-for-your-life behavior.



              Which brings us to palm fronds. Dragons are tall and, looking down, they can't see you sleeping beneath the fronds where you found a comfy place to sleep of the chase.



              Conclusion




              • Rhythms are going to happen for many reasons, the lack of a day/night cycle wouldn't stop that.


              • The need for protection would naturally create an artificial "night" due to the need to hide from predators. Burrows in the ground and palm fronds leading to buildings via the dawn of intellect.


              • Like my cat, one can rest at any time. Eat a big turkey meal and see how easy it is to fall asleep.


              • Therefore, I don't think you'd need to replace sleep at all.







              share|improve this answer









              $endgroup$



              My cat sleeps all the time...



              I'm going to advocate that sleep need not be lost in your circumstances. The Circadian rhythm is convenient, but I'm not convinced my cat knows what it is. Or, perhaps, our Latin brothers and sisters, who enjoy siesta.



              Rest can come at any time, whether through sleep or meditation.



              However, as I think about it, it's not necessarily true that the Circadian rhythm doesn't exist on your planet, either. It's an assumption that it exists because of the day/night cycle. But it's just as likely that life accommodated the day/night cycle. In other words, it's easily believed that a periodic cycle exists with your creatures despite no day/night cycle.



              Even on a tidally-locked planet, there are cycles



              Life on a tidally-locked planet must have cycles. Things are born, grow old, and die. Energy is put into flowering, then fruit, then restoring. You run from the dragon until you get tired and are forced to stop and rest. Well... and then you die a gruesome death... but that's actually important.



              Darkness cometh from palm fronds



              I can easily imagine that part of the development of Earth's Circadian rythym came from the need for protection. You get tired, and not wanting to be et by the dragon, you find someplace well protected... out of sight... dark, where the dragon can't find you. (That you need protection regularly at night simply reinforces the rhythm.) A lot of the "rhythm" of your planet (and perhaps any planet) would come from the predator-prey fight/hide-for-your-life behavior.



              Which brings us to palm fronds. Dragons are tall and, looking down, they can't see you sleeping beneath the fronds where you found a comfy place to sleep of the chase.



              Conclusion




              • Rhythms are going to happen for many reasons, the lack of a day/night cycle wouldn't stop that.


              • The need for protection would naturally create an artificial "night" due to the need to hide from predators. Burrows in the ground and palm fronds leading to buildings via the dawn of intellect.


              • Like my cat, one can rest at any time. Eat a big turkey meal and see how easy it is to fall asleep.


              • Therefore, I don't think you'd need to replace sleep at all.








              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered Feb 10 at 19:02









              JBHJBH

              44.6k696211




              44.6k696211












              • $begingroup$
                Hmm, I don't fully agree. The ancestral genes which gave rise to the circadian clocks today evolved over 1 billion years ago, when there was no hiding in darkness or recognizable predator/prey relations. The gene coincides with day/night. So on my planet we would not have evolved this gene in the first place. We might hide in darkness, but darkness wouldn't evoke the desire to sleep. That said, you're right that my planet will have plenty of other cycles which may be the root of their own rest/activity cycle of some kind. I will have to think about what cycles will work for this. Thanks!
                $endgroup$
                – Lisa
                Feb 10 at 19:33










              • $begingroup$
                This is a good answer sleep is not caused by circadian rhythms, Circadian rhythms are a just a convenient way to regulate it in some animals. Sleep is just a requirement of how brains work, especially large complex brains. Even animals that live in total darkness sleep, and many animals sleep during the day or irregardless of day/night cycles.
                $endgroup$
                – John
                Feb 10 at 22:02












              • $begingroup$
                Even creatures without brains (medusozoans) sleep, so it's clearly coded in the genome even before brains.
                $endgroup$
                – pojo-guy
                Feb 10 at 23:20










              • $begingroup$
                @pojo-guy, Jellyfish sleep? I had no idea. Cheers!
                $endgroup$
                – JBH
                Feb 10 at 23:22






              • 1




                $begingroup$
                sciencemag.org/news/2017/09/…
                $endgroup$
                – pojo-guy
                Feb 10 at 23:56


















              • $begingroup$
                Hmm, I don't fully agree. The ancestral genes which gave rise to the circadian clocks today evolved over 1 billion years ago, when there was no hiding in darkness or recognizable predator/prey relations. The gene coincides with day/night. So on my planet we would not have evolved this gene in the first place. We might hide in darkness, but darkness wouldn't evoke the desire to sleep. That said, you're right that my planet will have plenty of other cycles which may be the root of their own rest/activity cycle of some kind. I will have to think about what cycles will work for this. Thanks!
                $endgroup$
                – Lisa
                Feb 10 at 19:33










              • $begingroup$
                This is a good answer sleep is not caused by circadian rhythms, Circadian rhythms are a just a convenient way to regulate it in some animals. Sleep is just a requirement of how brains work, especially large complex brains. Even animals that live in total darkness sleep, and many animals sleep during the day or irregardless of day/night cycles.
                $endgroup$
                – John
                Feb 10 at 22:02












              • $begingroup$
                Even creatures without brains (medusozoans) sleep, so it's clearly coded in the genome even before brains.
                $endgroup$
                – pojo-guy
                Feb 10 at 23:20










              • $begingroup$
                @pojo-guy, Jellyfish sleep? I had no idea. Cheers!
                $endgroup$
                – JBH
                Feb 10 at 23:22






              • 1




                $begingroup$
                sciencemag.org/news/2017/09/…
                $endgroup$
                – pojo-guy
                Feb 10 at 23:56
















              $begingroup$
              Hmm, I don't fully agree. The ancestral genes which gave rise to the circadian clocks today evolved over 1 billion years ago, when there was no hiding in darkness or recognizable predator/prey relations. The gene coincides with day/night. So on my planet we would not have evolved this gene in the first place. We might hide in darkness, but darkness wouldn't evoke the desire to sleep. That said, you're right that my planet will have plenty of other cycles which may be the root of their own rest/activity cycle of some kind. I will have to think about what cycles will work for this. Thanks!
              $endgroup$
              – Lisa
              Feb 10 at 19:33




              $begingroup$
              Hmm, I don't fully agree. The ancestral genes which gave rise to the circadian clocks today evolved over 1 billion years ago, when there was no hiding in darkness or recognizable predator/prey relations. The gene coincides with day/night. So on my planet we would not have evolved this gene in the first place. We might hide in darkness, but darkness wouldn't evoke the desire to sleep. That said, you're right that my planet will have plenty of other cycles which may be the root of their own rest/activity cycle of some kind. I will have to think about what cycles will work for this. Thanks!
              $endgroup$
              – Lisa
              Feb 10 at 19:33












              $begingroup$
              This is a good answer sleep is not caused by circadian rhythms, Circadian rhythms are a just a convenient way to regulate it in some animals. Sleep is just a requirement of how brains work, especially large complex brains. Even animals that live in total darkness sleep, and many animals sleep during the day or irregardless of day/night cycles.
              $endgroup$
              – John
              Feb 10 at 22:02






              $begingroup$
              This is a good answer sleep is not caused by circadian rhythms, Circadian rhythms are a just a convenient way to regulate it in some animals. Sleep is just a requirement of how brains work, especially large complex brains. Even animals that live in total darkness sleep, and many animals sleep during the day or irregardless of day/night cycles.
              $endgroup$
              – John
              Feb 10 at 22:02














              $begingroup$
              Even creatures without brains (medusozoans) sleep, so it's clearly coded in the genome even before brains.
              $endgroup$
              – pojo-guy
              Feb 10 at 23:20




              $begingroup$
              Even creatures without brains (medusozoans) sleep, so it's clearly coded in the genome even before brains.
              $endgroup$
              – pojo-guy
              Feb 10 at 23:20












              $begingroup$
              @pojo-guy, Jellyfish sleep? I had no idea. Cheers!
              $endgroup$
              – JBH
              Feb 10 at 23:22




              $begingroup$
              @pojo-guy, Jellyfish sleep? I had no idea. Cheers!
              $endgroup$
              – JBH
              Feb 10 at 23:22




              1




              1




              $begingroup$
              sciencemag.org/news/2017/09/…
              $endgroup$
              – pojo-guy
              Feb 10 at 23:56




              $begingroup$
              sciencemag.org/news/2017/09/…
              $endgroup$
              – pojo-guy
              Feb 10 at 23:56











              5












              $begingroup$

              Circadian rhythms regulate the timing of sleep. They do not create the need for it.



              A body in an area without day-night cycles would still require sleep. People and animals who lived in Arctic regions before artificial light still slept in the height of summer or winter, as well as year-round, despite drastic changes in the amount of sun each day.



              People who are completely blind (with zero awareness of light or who simply don't have eyes) still sleep and need to sleep (they're not just doing it for cultural reasons). But they often don't have 24-hour rhythms and may have disorders that stem from that.



              One of the most important things we need sleep for is the generation of Growth Hormone. GH is released primarily during sleep. It, and its downstream products such as IGF-1, regulate insulin use in the body, strength bones, produce breastmilk in lactating women, help with detoxification pathways, and dozens of other things.



              GH also rebuilds muscle. If you're familiar with the rule for weightlifting that you only work out a set of muscles every other day or less, this is why. Exercise breaks down your muscles and restorative sleep releases GH that builds your muscles back up (bigger and stronger in many cases, but also what you need to maintain strength).



              The myth is that only growing children need GH. The reality is that everyone needs it (not too much of it, but just the right amounts). Adults with GH deficiency (which can be a holdover from childhood or it can be adult-onset) are often tired and weak because their muscles aren't getting built back up after everyday activity like they should.



              While other activities can release GH from the pituitary, deep sleep is really what you need to do it right. All humans need sleep and this is a large reason why.



              Other reasons for sleep include: a full relaxation of the voluntary muscles (very hard to do without being asleep, though not impossible) and dreaming. The brain differences in various stages of sleep and dreaming are important. They affect both our physical health and our mental health.



              To replace sleep, you would still need a cyclical restorative process.






              share|improve this answer









              $endgroup$


















                5












                $begingroup$

                Circadian rhythms regulate the timing of sleep. They do not create the need for it.



                A body in an area without day-night cycles would still require sleep. People and animals who lived in Arctic regions before artificial light still slept in the height of summer or winter, as well as year-round, despite drastic changes in the amount of sun each day.



                People who are completely blind (with zero awareness of light or who simply don't have eyes) still sleep and need to sleep (they're not just doing it for cultural reasons). But they often don't have 24-hour rhythms and may have disorders that stem from that.



                One of the most important things we need sleep for is the generation of Growth Hormone. GH is released primarily during sleep. It, and its downstream products such as IGF-1, regulate insulin use in the body, strength bones, produce breastmilk in lactating women, help with detoxification pathways, and dozens of other things.



                GH also rebuilds muscle. If you're familiar with the rule for weightlifting that you only work out a set of muscles every other day or less, this is why. Exercise breaks down your muscles and restorative sleep releases GH that builds your muscles back up (bigger and stronger in many cases, but also what you need to maintain strength).



                The myth is that only growing children need GH. The reality is that everyone needs it (not too much of it, but just the right amounts). Adults with GH deficiency (which can be a holdover from childhood or it can be adult-onset) are often tired and weak because their muscles aren't getting built back up after everyday activity like they should.



                While other activities can release GH from the pituitary, deep sleep is really what you need to do it right. All humans need sleep and this is a large reason why.



                Other reasons for sleep include: a full relaxation of the voluntary muscles (very hard to do without being asleep, though not impossible) and dreaming. The brain differences in various stages of sleep and dreaming are important. They affect both our physical health and our mental health.



                To replace sleep, you would still need a cyclical restorative process.






                share|improve this answer









                $endgroup$
















                  5












                  5








                  5





                  $begingroup$

                  Circadian rhythms regulate the timing of sleep. They do not create the need for it.



                  A body in an area without day-night cycles would still require sleep. People and animals who lived in Arctic regions before artificial light still slept in the height of summer or winter, as well as year-round, despite drastic changes in the amount of sun each day.



                  People who are completely blind (with zero awareness of light or who simply don't have eyes) still sleep and need to sleep (they're not just doing it for cultural reasons). But they often don't have 24-hour rhythms and may have disorders that stem from that.



                  One of the most important things we need sleep for is the generation of Growth Hormone. GH is released primarily during sleep. It, and its downstream products such as IGF-1, regulate insulin use in the body, strength bones, produce breastmilk in lactating women, help with detoxification pathways, and dozens of other things.



                  GH also rebuilds muscle. If you're familiar with the rule for weightlifting that you only work out a set of muscles every other day or less, this is why. Exercise breaks down your muscles and restorative sleep releases GH that builds your muscles back up (bigger and stronger in many cases, but also what you need to maintain strength).



                  The myth is that only growing children need GH. The reality is that everyone needs it (not too much of it, but just the right amounts). Adults with GH deficiency (which can be a holdover from childhood or it can be adult-onset) are often tired and weak because their muscles aren't getting built back up after everyday activity like they should.



                  While other activities can release GH from the pituitary, deep sleep is really what you need to do it right. All humans need sleep and this is a large reason why.



                  Other reasons for sleep include: a full relaxation of the voluntary muscles (very hard to do without being asleep, though not impossible) and dreaming. The brain differences in various stages of sleep and dreaming are important. They affect both our physical health and our mental health.



                  To replace sleep, you would still need a cyclical restorative process.






                  share|improve this answer









                  $endgroup$



                  Circadian rhythms regulate the timing of sleep. They do not create the need for it.



                  A body in an area without day-night cycles would still require sleep. People and animals who lived in Arctic regions before artificial light still slept in the height of summer or winter, as well as year-round, despite drastic changes in the amount of sun each day.



                  People who are completely blind (with zero awareness of light or who simply don't have eyes) still sleep and need to sleep (they're not just doing it for cultural reasons). But they often don't have 24-hour rhythms and may have disorders that stem from that.



                  One of the most important things we need sleep for is the generation of Growth Hormone. GH is released primarily during sleep. It, and its downstream products such as IGF-1, regulate insulin use in the body, strength bones, produce breastmilk in lactating women, help with detoxification pathways, and dozens of other things.



                  GH also rebuilds muscle. If you're familiar with the rule for weightlifting that you only work out a set of muscles every other day or less, this is why. Exercise breaks down your muscles and restorative sleep releases GH that builds your muscles back up (bigger and stronger in many cases, but also what you need to maintain strength).



                  The myth is that only growing children need GH. The reality is that everyone needs it (not too much of it, but just the right amounts). Adults with GH deficiency (which can be a holdover from childhood or it can be adult-onset) are often tired and weak because their muscles aren't getting built back up after everyday activity like they should.



                  While other activities can release GH from the pituitary, deep sleep is really what you need to do it right. All humans need sleep and this is a large reason why.



                  Other reasons for sleep include: a full relaxation of the voluntary muscles (very hard to do without being asleep, though not impossible) and dreaming. The brain differences in various stages of sleep and dreaming are important. They affect both our physical health and our mental health.



                  To replace sleep, you would still need a cyclical restorative process.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Feb 11 at 0:15









                  CynCyn

                  8,69311844




                  8,69311844






























                      draft saved

                      draft discarded




















































                      Thanks for contributing an answer to Worldbuilding Stack Exchange!


                      • Please be sure to answer the question. Provide details and share your research!

                      But avoid



                      • Asking for help, clarification, or responding to other answers.

                      • Making statements based on opinion; back them up with references or personal experience.


                      Use MathJax to format equations. MathJax reference.


                      To learn more, see our tips on writing great answers.




                      draft saved


                      draft discarded














                      StackExchange.ready(
                      function () {
                      StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fworldbuilding.stackexchange.com%2fquestions%2f138854%2fways-other-than-sleep-to-restore-cells-neurons%23new-answer', 'question_page');
                      }
                      );

                      Post as a guest















                      Required, but never shown





















































                      Required, but never shown














                      Required, but never shown












                      Required, but never shown







                      Required, but never shown

































                      Required, but never shown














                      Required, but never shown












                      Required, but never shown







                      Required, but never shown







                      Popular posts from this blog

                      How to change which sound is reproduced for terminal bell?

                      Can I use Tabulator js library in my java Spring + Thymeleaf project?

                      Title Spacing in Bjornstrup Chapter, Removing Chapter Number From Contents