Here in Belgium, most houses don't have airconditioning. We don't really need it, as most summers are not that hot. So the bedrooms easily have a higher temperature when there is a heatwave going on, like right now.
Lots of people I know find it difficult to sleep in their warm bedroom. Personally, I don't have a problem. I get into my bed, open up a window and wait a few minutes until the sweat has dried up. Then I almost immediately fall asleep. I've always been blessed with a good sleep and wake up refreshened.
So how about you???