Used a CPAP for years. Taking off over 100 lbs helped reduce the need, but still use it as it helps me get into REM sleep. Just got to be careful not to hang myself when I roll over. Being SCUBA certified helps get used to it...
I’m a certified diver too. I heard a few days ago that it is actually harder for some to do both because the CPAP=breathing through the nose, SCUBA=breathing through the mouth.
FWIW.