I have heard of this from several TOSers, so I think you are not alone on this one.

I have to lay in bed, and specifically change from side to side to stay most comfortable and for breathing. Laying on my back seems to cause breathing difficulty. And on stomach - well, where do the arms go comfortably? So it's side to side.

I also sweat on my bed from RSD sometimes having to change it (pull off the sheets) or lay on a towel until my home aid comes to the house to help change it.

I usually change my PJs twice at night, due to the sweat, despite wearing very soft and light material. When I am doing better, there is much, much less sweating.