system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why is it that we are able to subconsciously control our bladders when we sleep? How is it that we manage not to piss ourselves?

I know this is a stupid question but I'm laying in bed and it's late at night, so please forgive me.
gpt
Your body releases a hormone while you sleep called vasopressin which inhibits the production of urine. You produce less urine while you sleep, and it's a thicker, more dense liquid (partly because of the hormone, partly because you're not drinking while you're asleep). 

People who have lower naturally occurring levels of vasopressin have to take a synthetic form of it called desmopressin before they go to sleep. And that's why we don't piss ourselves!