I have a couple of questions about this. Did you end up putting your tongue above or below the shelf? Do you sleep on your side or on your back?

Thank you for updating!

Thank you!

Thank you for sharing your experience with this!

Are you using this to prevent mouth leaking or filling up with air from the tongue falling back and down? If so, does it seem to work for that?

May I ask if you could tell me more about the piece of plastic seal you mentioned?

Thank you.

Here's the bottom line after trial and error: the problem is neither keeping the jaw or lips shut. It is keeping my tongue from relaxing and falling back. Once I lose the vacuum my tongue creates by keeping it pressed against my teeth, the air pressure from the CPAP pushes up into my mouth and forc...