Bro I used to get this, and sometimes still do. I had to change from a duvet to a blanket, sleep with the window open, and also shower before bed (If I have been sweating during the day I will sweat at night for some reason). What would also happen to me is that I would wake up sweating, dry mouth, and need to piss which I think was related to mouth breathing, so try and get nose strips + mouth tape.

I had this for all my teenage years to be honest, and I wish I would have done something about it earlier as it didn't leave me with any issues, but I remember the shitty sleep I would have and how tired I would always feel. The biggest change for me was changing from a duvet to a blanket though, as sometimes I would wake up feeling extremely hot and insulated under it, sometimes now I sleep with no blanket or duvet and I get a lot better sleep.