Oh yeah, I'd almost credit them with a large portion of saving our marriage, or at least saving me from a count of manslaughter
My FIL has a CPAP as well, someday my H may need one too. He's also one who can sleep through just about any noise, but have a little lightening and he's wide awake LOL. He can't stand any light in a room when he's sleeping at all....I can handle light, just not noise...we are so totally opposite there, but fortunately we are learning to work around it.
Choc, if she's never tried earplugs...give em a shot, it's at the very least a very inexpensive thing to try.
