D.P.
Sleep apnea is a dangerous thing...even leathal. maybe do some research for him about the problems it causes if untreated. I was with my husband for about 7 years before he went in to have it diagnosed. I slept just as terrible because he was so loud and annoying. When my husband got tested he was off the charts....when he brought home his machine i cried...it has changed his life: better sleep for both of us, he is more rested and less crabby, and it has a lot of health benefits.
URGE him to go...the results might be very surprising to him.