eli5 why do we wake up from deep sleep to pee but don’t actually wet the bed ?

Question

eli5 why do we wake up from deep sleep to pee but don’t actually wet the bed ?

In: 3347

Answer 1

There are nerves inside your bladder that can sense when it’s starting to stretch. As it stretches, it sends signals to your brain telling you that you have to pee. At first, there’s not much pee in there so the signals are really weak. You barely even notice them when you’re awake. But then more and more urine fills your bladder and the signal gets stronger and stronger, until finally it’s so strong, it literally wakes you up. And you feel like you have to pee a gallon. The previous signals weren’t strong enough to wake you.