I have never really gone for sleeping naked on account of the cold. Except on one occasion when we rented an upstairs flat which got all day sun so there was glass house effect which would last all day and night in summer. Music festivals usually naked though it is not unheard of to need to sleep with your clothes on in a sleeping bag as summer nights can be freezing and wake up just before dawn almost frozen. I think sleeping naked generally was more fashionable in the past. I am talking about the 1980s here, when casual nudity, certainly in my circle of friends, was just what would happen in communal living arrangements as in shared accommodation. It was never a big deal.