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What happens to weight when we sleep?

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  • What happens to weight when we sleep?

    So I'm assuming I'm not unusual here, and I tend to lose 1 to 1.5 kgs of weight overnight. I weigh myself before bed, and I weigh myself when I wake up, and there is a 1 to 1.5 kg difference. And yes, I'm always lighter in the morning.

    So what is lost? I just do not believe that I sweat and exhale 1.5kg of water over the course of 8 or 9 hours, I certainly don't mess my bed (or get up to pee in the middle of the night).

    This has been bugging me for a while. Any ideas?

    --Me

  • #2
    Your soul leaves.

    Sent via lightsaber

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    • #3
      It's as you suggested. Mostly water weight, and much of it through respiration.

      If you woke up heavier, we'd have a real conundrum. But the slight weight loss is to be expected.
      The Champagne of Beards

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      • #4
        Yeah, but 1 to 1.5kg is A LOT of water!

        --Me

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        • #5
          Originally posted by adamm View Post
          Yeah, but 1 to 1.5kg is A LOT of water!

          --Me
          Go breathe on a mirror. What happens? What's the moisture content of your expelled breath? Multiply that by 9 hours. It IS a lot of water.
          The Champagne of Beards

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          • #6
            Originally posted by adamm View Post
            Yeah, but 1 to 1.5kg is A LOT of water!

            --Me
            That's a light day of loss for me. Of course, I usually have to "relieve" myself first thing as well, so there's a bit more there.
            I got 99 problems but a pancake ain't one...

            My Journal

            Height: 6'3"
            SW (Feb 2012): 278
            SBF: 26% (Scale)
            CW (Sept 2015): 200
            CBF: 17% (Scale)

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            • #7
              Respiration, perspiration, shed skin, energy useage. IIRC you respire about a liter of water a day.

              At 4C a liter of water weighs around 1KG.
              -Ryan Mercer my blog and Genco Peptides my small biz

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              • #8
                Originally posted by ryanmercer View Post
                Respiration, perspiration, shed skin, energy useage. IIRC you respire about a liter of water a day.

                At 4C a liter of water weighs around 1KG.
                Yeah, well. If you respire 1 liter of water (or 1 kg of water) a day, and you sleep for 8 hours, then you are only respiring 1/3 of a litre (or kg). Where is the other 2/3rds + of water?

                --Me

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                • #9
                  Originally posted by adamm View Post
                  Yeah, well. If you respire 1 liter of water (or 1 kg of water) a day, and you sleep for 8 hours, then you are only respiring 1/3 of a litre (or kg). Where is the other 2/3rds + of water?

                  --Me
                  That is going to depend heavily on intake, but you're also making the assumption that the respiration occurs evenly throughout the day. Even without looking into it, I can guess that it is a false assumption.
                  I got 99 problems but a pancake ain't one...

                  My Journal

                  Height: 6'3"
                  SW (Feb 2012): 278
                  SBF: 26% (Scale)
                  CW (Sept 2015): 200
                  CBF: 17% (Scale)

                  Comment


                  • #10
                    Originally posted by adamm View Post
                    Yeah, well. If you respire 1 liter of water (or 1 kg of water) a day, and you sleep for 8 hours, then you are only respiring 1/3 of a litre (or kg). Where is the other 2/3rds + of water?

                    --Me
                    Energy expenditure... like I said... REM sleep burns more calories than just laying there watching tv a 150lb person is looking at 90-110 kcals an hour while sleeping depending on if in REM or not, sweat (moisture), sweat (fatty secretion from the apocrine sweat glands in your armpits/genitals/anus), you lose something like 50k skin cells a minute (there is something like a billion tons of dead skin cells in the atmosphere, you know when you see dust in a beam of sunlight through a window? Yeah that dust is 80% dead skin cells on average).
                    -Ryan Mercer my blog and Genco Peptides my small biz

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                    • #11
                      Originally posted by ryanmercer View Post
                      Yeah that dust is 80% dead skin cells on average).
                      mmm dead skin cells

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                      • #12
                        You lose carbon also. The carbon in fat and glucose leaves as carbon dioxide.
                        My opinions and some justification

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                        • #13
                          But it's mostly just piss. Seriously. Have you ever seen a 24-hour urine? It's like a gallon and a half sometimes. Water weighs 8 pounds a gallon, so even if you only pee half a gallon, that's 4 pounds. Just in pee.
                          Crohn's, doing SCD

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                          • #14
                            Any Doctor Who fans out there?


                            "The fat just walks away!"
                            Depression Lies

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                            • #15
                              Love doctor who :-D

                              Sent from my GT-I9300

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