Is it really possible to fall asleep when you're having sex??

Dunno

It is

Maybe, if you’re an easy sleeper.

I'm sure if your really exhausted you could.

yeah, sometimes you just get sleepy. some people even have a reaction of passing out from orgasm or, in more rare cases, from extreme arousal.

he was still kinda drunk

sometimes I get sleepy while jerking off, maybe is because of the stimulation?