Have you given much thought to the temperature at which you fall asleep? I haven’t. Turning on a fan or opening/closing windows is always a game-time decision for me, right when I’m about to hit the hay.
My feet and hands are always chilly, so I prefer to hop in bed when the sheets aren’t ice cold. But if it’s too warm (especially with my furry baby animal heaters,) I’ll wake up in the middle of the night hot and uncomfortable.