My best friend's DH has what was diagnosed as SEVERE sleep apnea. He went to a sleep study clinic. He was fitted for a cpap machine. They delivered it to his house. THAT WAS ONE YEAR AGO. It just SITS on his nightstand. My DGF said that the mask is too tight (or something). I told her to call the company and have them come back out and re-size it or whatever....NO she said because her DH hates it anyway.
DGF has not slept in the same room with him in maybe easily 5 or 6 years (at least) and it is HE** when they go away and have to stay in the same hotel room because DGF does not sleep at all!!!
Her DH is incredibly overweight and smokes 3-4 packs a day. His MD said "maybe" if he lost some weight and stopped smoking it would greatly improve his sleep apnea. DGF said her DH will never do that at all...

!!
We went away with them to Mohegan Sun and they were in the room next to us and DH and I could hear him through the wall...I really felt bad for DGF. She looked awful in the morning and her DH had a bad headache. When he asked for the tylenol I asked WHY...and they both said he wakes up every single morning with a headache....