shorts and a simple sleeveless shirt. As far as i know, there are ppl who sleep in their undies, or sometimes...nothing!
Boxers... Briefs... Shorts... Nothing... all depends whether or not I remembered to do the laundry... =P
It varies. Sometimes I wear shorts and long pants. And for the top i usually wear tshirts but then if it gets very cold i would wear a sweater over it.