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Thread: Why does sleep remove hunger?

  1. #1 Why does sleep remove hunger? 
    Forum Ph.D. Raziell's Avatar
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    Short version:

    Why - if hungry - does the body remove the hunger signals after sleep when the need for food is still there?

    Long version:

    So... you are going to bed starving. As you are too lazy to make food first. While you lie in bed all you can think of is "Damn that toast with bacon and eggs tomorrow morning will taste good!

    Alas, you wake up - and those 10 minutes you spent dreeeeeaming about food before you fell asleep was a utter failure. You sit there with zero hunger and can barely manage a single bite for breakfast.

    1) You are hungry before bed, starving even. A clear message from the body that "HEY! You should eat. You need nutrition."
    2) The body still need that energy, heck - even more at this point!
    3) So why did the body stop sending hunger signals when logically speaking - you should be even more hungry?

    Ive learnt my lesson, always eat when hungry. Especially when you are as skinny as me and should eat more. Even if its late and Im tired I make that damn meal. But Im still curios what exactly the body does during sleep that completely removes hunger for hours when waking up.

    What causes it and is it an advantage or disadvantage for an organism to behave this way?


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  3. #2  
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    Quote Originally Posted by Raziell View Post

    . But Im still curios what exactly the body does during sleep that completely removes hunger for hours when waking up.

    What causes it and is it an advantage or disadvantage for an organism to behave this way?
    I do not personally seem to have that sensation. Ever. Wish I did, though. jocular


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    Quote Originally Posted by jocular View Post
    Quote Originally Posted by Raziell View Post

    . But Im still curios what exactly the body does during sleep that completely removes hunger for hours when waking up.

    What causes it and is it an advantage or disadvantage for an organism to behave this way?
    I do not personally seem to have that sensation. Ever. Wish I did, though. jocular
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    Quote Originally Posted by Raziell View Post
    Why - if hungry - does the body remove the hunger signals after sleep when the need for food is still there?
    Hunger is only indirectly and imperfectly related to "the need for food." If your body needs more glucose it will secrete glucagon; this causes breakdown of glycogen in the liver (and other places in the body) thus releasing glucose into the blood. If there's too much it will release insulin and increase glucose uptake. In most people insulin and glucagon levels are related to both time of day and "need for food."
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    Quote Originally Posted by billvon View Post
    Quote Originally Posted by Raziell View Post
    Why - if hungry - does the body remove the hunger signals after sleep when the need for food is still there?
    Hunger is only indirectly and imperfectly related to "the need for food." If your body needs more glucose it will secrete glucagon; this causes breakdown of glycogen in the liver (and other places in the body) thus releasing glucose into the blood. If there's too much it will release insulin and increase glucose uptake. In most people insulin and glucagon levels are related to both time of day and "need for food."
    So being hungry gives no true indication for the real need for nutritients in the body? O.o
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    Quote Originally Posted by Raziell View Post
    So being hungry gives no true indication for the real need for nutritients in the body? O.o
    It's not an accurate indication, no. But it gives a _rough_ indication, which is usually good enough. (Obviously it doesn't work all the time; witness the morbidly obese people who are eating when they're hungry.)
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    So being hungry gives no true indication for the real need for nutritients in the body?
    The need for nutrients might show up in the choice of foods when you do eat. But as often as not, food choices are about tastes and preferences other than straight nutrition.
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  9. #8  
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    When you sleep, your gastrointestinal tract almost shuts down. I'm guessing that in this condition it accumulates a comfy layer of mucus, that suppresses any raw-empty sensations. Then your other cue would be feeling a lack of energy, which a cup of coffee may pretend to fix.
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    Personally, the only time I have been hungry when asleep was when I got home and there was no food in the house and I hadn't eaten for many hours, due to travel constrictions. I find eating when I am hungry is what works for me.
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    Quote Originally Posted by Raziell View Post
    Short version:

    Why - if hungry - does the body remove the hunger signals after sleep when the need for food is still there?

    Long version:

    So... you are going to bed starving. As you are too lazy to make food first. While you lie in bed all you can think of is "Damn that toast with bacon and eggs tomorrow morning will taste good!

    Alas, you wake up - and those 10 minutes you spent dreeeeeaming about food before you fell asleep was a utter failure. You sit there with zero hunger and can barely manage a single bite for breakfast.

    1) You are hungry before bed, starving even. A clear message from the body that "HEY! You should eat. You need nutrition."
    2) The body still need that energy, heck - even more at this point!
    3) So why did the body stop sending hunger signals when logically speaking - you should be even more hungry?

    Ive learnt my lesson, always eat when hungry. Especially when you are as skinny as me and should eat more. Even if its late and Im tired I make that damn meal. But Im still curios what exactly the body does during sleep that completely removes hunger for hours when waking up.

    What causes it and is it an advantage or disadvantage for an organism to behave this way?
    Hunger generally interferes with sleep and if you have eaten well during the day you shouldn't be hungry at night. In your place I would go and get my blood sugar levels checked out - especially if that lack of hunger in the morning is accompanied by feeling a little bit queasy.
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    I, personally do NOT Like eating first after waking up.....about 30 minutes later is more for me.
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    i don't think everyone agrees with you... and have same hunger sleep signals...
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  14. #13  
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    Quote Originally Posted by blackscorp View Post
    i don't think everyone agrees with you... and have same hunger sleep signals...
    No offense intended, but that post was directed at ??????
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    Sleeping doesn't remove my hunger, but I'm usually a lot more interested in caffeine jolt when I first get up.

    Since this is the biology subforum, please folks try to add some meat to the thread. Surely some scientist has studied this and has at a minimum abstracts summarizing their work. Otherwise this is a better fit for the general sub forum.
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    Quote Originally Posted by Lynx_Fox View Post
    Sleeping doesn't remove my hunger, but I'm usually a lot more interested in caffeine jolt when I first get up.

    Since this is the biology subforum, please folks try to add some meat to the thread. Surely some scientist has studied this and has at a minimum abstracts summarizing their work. Otherwise this is a better fit for the general sub forum.
    There appears to be some basis for Circadiam Rhythms playing a role in hunger. This study suggests that hunger peaks in the evening and has its valley in the mornings, likely a result of sleep being a fasting period. Perhaps the fact that you haven't eaten the night before is irrelevant to the amount of hunger your experience in the morning - as the threshold is lowered at any rate, without respect for food consumed the evening prior.

    The internal circadian clock increas... [Obesity (Silver Spring). 2013] - PubMed - NCBI
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  17. #16  
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    When i'm hungry i can't fall asleep, so it doesn't work
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  18. #17  
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    I go to sleep with a piece of pizza in my mouth every night, that's why I wake up full.

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    I'm not a biologist, but if I eat right before bed I wake up hungry. If I eat several hours before bed, I don't wake up hungry.

    To quote Bill O'Reilly, "You can't explain that."
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    Quote Originally Posted by Raziell View Post
    Short version:

    Why - if hungry - does the body remove the hunger signals after sleep when the need for food is still there?
    Well, while awake your energy needs are high, and your body coops slowly by releasing more energy from storage (fat deposits). When you sleep your energy needs drop, and the need for energy, and the energy you have evens out. Your blood sugar rises, and so you won't feel as weak as you would.

    Secondly, your digestive system has finished most of its work. Your stumack is empty, and thus costs no more energy, and you don't feel it anymore. The earliest hunger you will feel is when your stumack is emptying. After this it subsides.
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    Quote Originally Posted by babe View Post
    Quote Originally Posted by blackscorp View Post
    i don't think everyone agrees with you... and have same hunger sleep signals...
    No offense intended, but that post was directed at ??????
    topic starter...
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    Quote Originally Posted by blackscorp View Post
    Quote Originally Posted by babe View Post
    Quote Originally Posted by blackscorp View Post
    i don't think everyone agrees with you... and have same hunger sleep signals...
    No offense intended, but that post was directed at ??????
    topic starter...
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    Quote Originally Posted by babe View Post
    Quote Originally Posted by blackscorp View Post
    Quote Originally Posted by babe View Post
    Quote Originally Posted by blackscorp View Post
    i don't think everyone agrees with you... and have same hunger sleep signals...
    No offense intended, but that post was directed at ??????
    topic starter...
    Mahalo....*handing you makeup remover* you can now remove that blush! *chuckle*
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  24. #23  
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    How would you know if you felt hungry while asleep?
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    Quote Originally Posted by mikema63 View Post
    How would you know if you felt hungry while asleep?
    wake up... maybe
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  26. #25  
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    Quote Originally Posted by mikema63 View Post
    How would you know if you felt hungry while asleep?
    I think if you were that hungry, you'd wake up IMHO!
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    Sleep deprivation results in decreased glucose tolerance, decreased insulin sensitivity, decreased levels of leptin, and increased cortisol levels in the evening.
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  28. #27  
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    Quote Originally Posted by brooklyngirl27 View Post
    Sleep deprivation results in decreased glucose tolerance, decreased insulin sensitivity, decreased levels of leptin, and increased cortisol levels in the evening.
    What if you sleep too much and not too little?
    What if - for example - you tend to sleep 8-12 hours a day over an extended time?

    Which makes the hunger removal even more weird as sleeping friggin 12 hours should leave you STARVING when you wake up.
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    Most people wake up in the mornings with gas on their stomach and have to wait until something warm helps to remove the gas so they can eat. I do not think hunger goes away while one is asleep; the empty stomach is filled by the accumulation of gas.
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