get a CPAP machine and use it every night! there is no substitute for getting REM sleep and with sleep apnea you seldom, if ever, get into that sleep pattern. my world changed completely, I can function again without feeling like I could (and often do) fall asleep when I shouldn't!
Eating a handful of walnuts like used in baking cookies worked wonders for my brother to sleep through the night and he hasn’t for years. Try this, I know it sounds crazy, but my brother swears it works. Someone told him about this remedy and he also thought it was nuts, ( pardon the pun ) But it does work.
I found that not eating a 2-3 hrs. before bedtime cured my sleep apnea. No snacks either. Don't eat and lay down.I use to fear choking, now I don't.
Gargling twice daily for a few minutes opens up your air passage. I don't know how it works but it does. I wake up much less since doing this. I put a little baking soda in my water but plain tap water will do.
Just google throat exercises and do them. They will firm up and open airways. Some of the exercises are sounds, others are for the tongue, and some are mouth shapes. These exercises also seem to help for anxiety that makes your throat feel like it is tight.