I understand you well, I have the same problem. I cann't sleep for a very long time if the room is hot. I usually use a fan and bed linen for the summer, which is made from 100% natural materials that absorb sweat well and allow air to pass through. I have another problem, I can not sleep without a blanket, I definitely need to take cover with something and in summer it is a big problem, because I cannot sleep without a blanket, and it's too hot to sleep with a blanket. Now I try to choose a blanket for the summer, I read in this article https://comfortersetreviews.com/best...-hot-sleepers/ that there are several options that are really well suited for hot sleepers. I hope this will be a good solution to my problem.