I've never heard of a "jaw positioning device". How does it work?
The problem with sleep apnea is that the tongue and uvula get together to block the passage of air. I doubt that holding your jaw in any particular position is going to change that. It's gravity pulling down soft tissue.
I can go without the CPAP by sleeping on my side. But that is uncomfortable because my arm falls asleep or my shoulder hurts, so I have to turn over to the other side and start the whole cycle again. So I breathe well, but don't sleep well anyway.
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