As an alternative to the full-on CPAP machines & similar, you could also try
https://www.salinplus.com/.Not an air-pressure machine as such but works by putting super-fine salt particles into the air, which you then breathe in, & they clear your nose & so on.
My Mrs was always going crook that I was snoring, gasping for breath & so on overnight, which kept her awake, & also meant that I was waking up in the morning feeling exhausted. Had a sleep test that was "inconclusive"
Saw these machines discussed on another forum, thought I'd give it a go & got one last October. Since then, Mrs has commented on me snoring about 4 times
, & I also wake up feeling like I've had a good night's sleep
Cost about $160 - $180 & you're supposed to replace the salt pads about every 4 months at about $45 - $50, which I've now about to do as don't think I'm getting the full effect any more
Company also offers a no-questions-asked 60-day full refund - they reckon they refund about 1% of machines sold so there must be a lot a happy users out there
May not work in high humidity (+70%) though.
The big machine runs off 240v through a transformer which then puts out 9v @ 0.65A - I'll leave it up to the electrical wizards to work out whether you could adapt it to run off CT 12v power!
They also a Mini version available, which I think may be re-chargeable
Sleep well!