How can you gain weight while you sleep?

I weighed myself just before bed and I weighed 386.2

I went to bed, slept for 8 hours and when I got up I urinated and hopped back on the scale and guess what?  It says 387.8

Just to be sure I checked it twice and sure enough, it says I gained a pound while sleeping.

Last night I checked it twice also, because I didn’t want to be 386 either since I was down to 379 on Friday and have no idea how I could have gained this much weight.  I have not been drinking enough water, so I figured that was it.

Even though I am barely eating, I am gaining weight, BUT WHILE SLEEPING?  C’Mon

So weighing myself twice before bed, and getting the same result, and weighing myself twice after waking up and getting the same result, someone please tell me how I gained 1 pound while sleeping?

I mean the weight of the lost urine alone should have brought me down at least a pound.

This doesn’t seem physically possible.


I stayed up until 4am, and the last thing I ate was at 11pm, so I have not eaten for 5 hours before bed.  I normally go to bed around 2am… yes, I am a night owl and have been my whole life.

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7 Responses to How can you gain weight while you sleep?

  1. Thin John says:

    I have thought about this further, and I am only more baffled.

    During the night, there is transpiration, aka sweating of the skin, which should shed some water weight.

    Normally there is also water vapor loss via breathing (respiration), but since I have sleep apnea and the machine I use forces air into my nose after it passes over a water container, I doubt I will lose much water vapor if any. It is possible that I may actually gain a small amount of water via this method, but the amount of water in the container is small and only a very small portion of it disappears over night, so there is no way this could account for an entire pound of gain.

    This is really crazy.

  2. Anonymous says:

    You need to lose weight slowly regardless. Your body may start to hoard calories if you suddenly start getting much less calories than you are used to. This is probably temporary, but there are health risks associated with losing weight too fast. Up your fiber intake and talk to your doctor about how many calories you should be consuming per day so that you can lose weight safely. Fiber grips onto fats and carries them out via your digestive system.
    Try not to worry so much about 1 pound. There are natural fluctuations that your body goes through that may cause you to go up or down a pound here and there. Good Luck!

    • Thin John says:

      Thanks for your encouragement. I wish I had seen this post earlier.

      I wonder what health risks there are with losing weight too quickly?

      The only one that I know of is gallstones, and sure enough I had a problem there. In Sep I had my gallbladder removed after it caused me an emergency trip to the hospital.

  3. Anonymous says:

    I am in agreement with you John. I gained over a pound last night and can’t figure out why. Regardless of what happens to the food in our digestive system as we sleep, how can something (physical weight) be made from nothing? Example, a pound of X can’t become something greater than X as we sleep. Can it transform into something else like fat or muscle or fecal mater? Yes. Unless someone is feeding me or I am drawing moisture from the air, neither of which I actually believe, I don’t understand the weight gain.

  4. Anonymous2 says:

    Perhaps, there are more air in your stomach (as compared to the night before) which resulted in your mysterious weight gain.

  5. Allen M says:

    It’s likely the accuracy of the scale. For a scale to be able to accurately read 1/10th of a pound seems unlikely, especially if the scale has a large weight range. Temperature may make a difference on scale readings as well. Colder temperatures would normally mean slightly stiffer springs and I would assume a slightly lower weight read. There’s reasons doctors use balances rather than scales (sure, some use scales as “close enough”)

  6. Allen M says:

    Looks like you figured out in one if your later posts… The only other alternative would be sleep-eating. Rare, but it happens and certain sleep medication can definitely cause it.

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