I have the same issue. I always fall asleep breathing through my nose. However during the course of the night I must roll over and then my mouth opens and I wake up choking. I have been told I have to discipline myself and not roll on my back - BUT GOOD LUCK WITH THAT - I'M ASLEEP. ;-0) I just ordered a chin strap which has not come yet. Hopefully that will solve the problem. There are masks that cover both your nose and mouth.