Have you had a sleep study done? I actually have mine tonight. When you have a sleep study done they will put a CPAP machine on you during the night to see if it helps you any. The CPAP machine helps force air in.

From what I understand about the mouth pieces is that it keeps your tongue from falling back into your throat. It also keeps your jaw from falling backwards.

An ear,nose and throat doctor is a good place to start if you have sleep apena.

Good Luck,
Monty