How do you breathe sleeping on your stomach without the C-PAP? I assume it's with your head turned? I find that quite uncomfortable for my neck.
But I do have a C-PAP, and I sleep on my side, so my head is in a similar (though not identical) position. It's possible to do it, though it's easy to break the seal if you move your head wrong. I don't move in my sleep (though I can toss and turn a bit before falling asleep, or wake up to reposition), but if you do, you would probably lose the seal frequently.
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