(10-01-2015, 10:51 AM)PaulaO2 Wrote: Ah. Typical new user problem. Do you have an old ACE bandages around? Take one and wrap it around your jaw and head, like they used to if you had the mumps. You want it tight enough to hold your mouth closed when you relax but not so tight you cannot chew with effort. You want to be able to open your mouth in an emergency.

This is a poor man's chin strap. Try this for a night or two. If it works, and it helps keep your mouth closed, then you can get a real chin strap and use that. A full face mask (FFM) will also work but they tend to leak and are hard to fit. Try the chin strap first. It is quite possible that after a month or so, you can stop using the chin strap. What is happening is the air is blowing your mouth open. There's a trick to somehow another train your tongue to do something with the roof of your mouth but I've never managed to do it. Others can explain it better so I won't even try.