The CPAP will help if you can keep the face piece on. I tried at least a half dozen designs but always pulled them off during the night.
CPAP will also help with joint pain. When I went to a Rheumatologist, his first question was had I ever had a sleep study. It did not help me that I could notice, but I have severe osteoarthritis in every joint they Xray.
I have had no problems with the mask, but I chose the one that had the least mask they had. It just has little pillows for the nose and straps up the cheeks, and on top of the head, and a small strap from the side to back.
I use a head band to help keep my mouth shut, and sometimes, a headband to go over the straps and secure them-like an Indian head band, only wider and very soft. If someone turns on the light, I quickly pull it down over my eyes and go back to sleep.
I have constant joint pain from the beating I gave my body while on active duty. I have a hard time bending over anymore and have a hard time getting back up.
We'll see what the future brings.