It depends...a buddy of mine lost his medical for about six months (maybe 9?). He was in a nonflying job at the time so it wasn't a big deal. He flies for a major now and has a few hoops to jump through every now and then but it's worth it, IMO. If you truly have sleep apnea you want to get it addressed. Untreated it can knock years off your life and decrease QOL significantly.

He's drops by here occasionally and might give you the details.