i was concerned about my mouth opening while i sleep, because i didn't want a sore throat in the morning from breathing through my mouth. i decided to suck my tongue to the top of my mouth (mouth closed, and uvula toward front of tongue). now my mouth can't open while sleeping, my uvula can't move, and if i try to scream in a dream, i will only moan (unless i actually force my mouth open). you might experience a slightly swollen pallet from the pressure, but i only have this rarely, and it's very slight anyway. maybe someone can use this to change snoring habits.