OP- Sorry that this is long!
Has your DH has any testing on the sleep apnoea to assess for CPAP? It can be life threatening so please try to get him some help for him!
I put up with this for 15+yrs and wish I'd pushed much sooner! I'm a health profession, knew DH had sleep apnoea, long pauses, woke himself up etc and was at higher risk of heart attack, stroke etc. I filmed him snoring, the pauses etc to show him which made no difference to his denial. I tried all manner of ear plugs over the years.
Have you tried the epworth score? Epworth Sleepiness Scale | Asthma + Lung UK (asthmaandlung.org.uk) DH seemed either oblivious or unaware that he was falling asleep on the sofa at all times, and even fell off the toilet seat asleep one time! I did the test on what I'd observed of him, and he did it separately. He very much underestimated how sleepy he was and our scores were very different!
Strangely, we are registered at different GP's due to me meeting him years after he'd registered, the practice then moving and no longer being in the catchment. Anyways, I found out that his practice had an online referral/appointment option for various conditions. With DH's permission, I made an online referral on his behalf.
FINALLY- was diagnosed with severe, obstructive sleep apnoea and has had a CPAP for 9mths now. Its silent! I honestly cannot believe how quiet it is! He has lost 20kg because he has energy again, he now rarely sleeps on the sofa during the day and awakes refreshed. I sleep MUCH better now, but have been trying to wean myself off wearing earplugs.