All kinds of confused

My body is so confused once I go to bed...I never turn my heat up very high so my house is pretty chilly when I go to bed. Which is fine, I love having a cold house and getting under warm blankets to sleep. But this year almost every night I wake up in the middle of the night super hot. I then get to spend the rest of the night fight to find the right temperature to sleep. Usually once I get to sleep the temperature doesn't bother me that much, but I'm getting pretty sick of it. I just don't understand.