he's physically incapable of sleeping in socks or pants. he tends to overheat, even in the middle of winter when it's cold as shit, so he just sticks to boxers and t-shirts, or if it's really cold, boxers and a hoodie. he's the kind of guy that uses a quilt year-round, too. none of that flimsy thin sheet bullshit.
☮ : Bedroom/house/living quarters headcanon
there's a place for everything and he likes everything to be in its place, even if to an observer it doesn't look terribly organized. there's a system behind the madness, believe it or not.
once he learns how to cook, he has a habit of making way too much, so he either tries to pawn some off on a friend or saves it for leftovers. he doesn't like saving too many leftovers, though, because then he'll forget to eat them in favor of eating something loaded with sugar. naughty souda.