Sometimes when I'm lying in bed it feels like pressure is building in my face. I dunno what causes it maybe blood moving up to my head. Anyways I usually move and it stops. Once I decided to just see what would happen if I didn't move; soon I couldn't breathe or speak and lost all coordination and couldn't think of how to move myself. Eventually I managed to swat my gf in the head and roll over but I freaked her out lol she thought I was dying.