When I went to bed, the temperature was dropping, but I have a down comforter which is quite cozy so I wasn't worried about getting cold. I actually woke up in the middle of the night and again this morning because I was roasting hot. The house was at 53º when I climbed out of bed and it was cool, but I just put on some slippers and it felt pretty good after roasting in my bed all night long.
I actually think I would sleep better if my house was in the high 40s or perhaps lower. No, I do not have a fever, just a super hot body.