I have slept naked as long as I can remember I also have never closed the bedroom door, parents weren't nudists I just never minded being naked in front of others, and in the summertime I always slept on the bed with no covers and to this day the same applys open door, naked, have a non nudist living with me but he is cool with me being naked....have a wonderful naked day, say hi if you want happy to chat when I can..
Growing up in the South (USA) in the summertime was my initial motivation since our house didnt have air conditioning. We had what was termed a whole house fan which was located in the attic. The fan was operated during the evening until the next morning. It pulled the cooler, though majorly humid, night air into the house and exhausted it from the attic vents.
I was around five or six when I disdained wearing PJs and slept naked on top of the covers. Winters were under cover sleeping. I shared a bedroom with my younger brother from 12 till 16 yrs old. He had trouble sleeping from time to time so a night light was a feature of our shared bedroom. He told me he watched one night as I experienced a nocturnal emission / wet dream. His detailed recounting made me wonder if I should sleep on top of the covers afterwards but I determined we had a sufficiently close relationship that if he was bothered by it he would have said so. It was much more of a fascination for him and I truly got over my embarrassment.