eli5/ why do we have such a tolerance for needing to pee when asleep?

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if i am awake and drinking like I usually do i’ll pee extremely frequently and the accumulation of that fluid is never apparent when looking at me but when i wake up i have so much stuff to pee out that accumulated at the bladder that i look like I’ve just found out i’m pregnant why is it that if i tried to hold it in when i was awake i’d be in a great deal of discomfort but i don’t wake up in discomfort but am visibly swollen with fluid

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Anonymous 0 Comments

It has to do with how heavily you sleep. The urge to pee gets stronger and stronger depending on how much the stretch receptors in the bladder are triggered, so the bigger the bladder, the more the discomfort. When you’re awake, even a little bit of stretch is uncomfortable and you want to relieve it. It’s a bit like being in an uncomfortable position. When you’re awake you shift until you’re comfortable, but if you roll into an uncomfortable position sleeping, it has to be really uncomfortable to wake you up immediately. Normally you don’t notice the discomfort until you wake up in the morning.

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