From age 23 to 63 I slept naked, but then I developed a problem with itchy skin on my scrotum. So in order to keep the different bits of skin from rubbing against each other and causing great discomfort, I took to wearing Y fronts. So now I wear underpants every night, but wish I could still sleep naked. Also, since having frozen shoulder in both shoulders in the 2000's, I've slept with a small pillow or cushion so that I can rest the upper arm on it when I sleep on my side. I find I can't sleep without the support under my arm now, so I guess that will be permanent, just like the underpants.
I love sleeping in tights and a leotard. Waking up to that all-over spandex hug is very erotic. In the winter, fleece lined tights are unbeliveibly warm and cozy.
Before my wife had passed, I usually. would be completely nude, but , now without having her warm body next to me, for all seasons it depends now on the seasons and the temperature. In warm season, my home temp. is 72 and in the cold seasons. it is 84 degrees. So I now wear, is directly proportional, to the temperature. The colder it is the more clothes I would wear, usually it could be my panties and bra, or a nice nighty and without my panties and bra. The warmer it is, I usually do not wear anything.
I haven't wore anything to sleep in since I was a tweener. When starting puberty my cock and balls grew and would get tangled up in my now too small PJ's. Off came the bottoms at first for several nights and then I figured out it was futile to wear them at all. That was followed a few weeks later by ditching the tops and since then I have slept nude.
Usually a t-shirt and boxers. I sometimes go nude but it's weird, it feels hotter in the nude than clothed. So I don't do it too often.