What do you wear while sleeping?

Just a shirt on.I would really want to sleep without wearing anything but I sweat if my naked back lies down in one position for a long time no matter how cold the weather is.

I sleep in the same clothing that i was born in, my birthday suit. I used to try and sleep with some things on but I turn a lot and the clothing would not turn with me so it would almost "strangle" me. Even if I were wearing underwear it would twist and be very uncomfortable. When I was in the hospital with MRSA I could not get comfortable wearing anything so I took everything off and even at night I often times would not even have a sheet on. The nurses would cover me up and I would kick the covers off again , it was hot in the hospital.

My birthday suit! :-D It is the most comfortable!