I tried this last night and couldn't get it to work. But I had my mouth closed, breathing through my nose, and I have to kind of keep a little suction in my throat or something in order to keep my mouth closed, and because of that it keeps my tongue up against the roof of my mouth. If I relax my throat and jaw entirely my mouth just falls open, meaning Ill wake up either with drool all over my face or with my moth and tongue all dried out like old leather. Maybe I ought to go ahead and try it with my mouth open and see if it works better.