I sleep naked.
Best way to sleep.
Good way not to sleep too btw.
I knew a guy once who was paranoid about sleeping nude in case some emergency happened and he'd be grappling a burglar or running from a fire, for example, with no clothes on.
He HAD to sleep in his underwear, no matter what. His mates used to take the piss out of him for it all the time.
I always wondered if it was really because he'd feel vulnerable with his penis exposed in an emergency, or in fact if it was just really small and he'd be humiliated if anyone saw it.