I sleep naked, unless its freezing cold or I have reason to suspect that one of my housemates might barge into my room for late night girl talk. Although once I was naked and she barged in anyway, luckily I was in bed...

But... housemates. I can't really be naked around the house lol

Although a few times my Sir did have me sneak around a bit without clothes- in the basement, while everyone was asleep in the living room or kitchen etc...