Hi i was wondering what's the cause of me getting pounding headaches during sleep. i usually have them right before my menstrual cycle which is irreb.?

Several things: Teeth clinching at night may be the culprit. This increases with anxiety and if so it's called bruxism; a drug called Clonazepam can help. It may be migraines but i would at least use 2 aleve (naproxen) about an hour before bed during that time. Oh, don't forget the sinuses, Flonase is an excellent medication. Good luck, hope it helps, i'm betting on bruxism.

See below: You might consider getting this checked for a migraine - and if not a migraine with aura - there are ways to control this.