Hello tearsinabottle , I've noticed when going through periods of insomnia, that I get to learn where all the cold drafts are in my bedroom , one comes up the side of the bed and wall,
I sometimes wear socks T-shirt, but gradually take them off during the night , but sometimes have to put them back on.

In the summer is worse because I can't sleep if I don't have a heavy duvet over me
Do you have that problem ?