I also had this problem onest, but I solved it, just drink much water one hour before you go sleeping. I drink nothing, and go to the bathroom, right before I want to sleep, I drink only a little, little bit and try to sleep.
It works, Trust me.
Yea, and than I am waking 20 minutes before my alarm rings up. :)
Amerikanische Ingenieurskunst.
Los, Deutsche wir bauen damit ein Flugzeug.