I was diagnosed about 4 years ago. Can't afford the machine. Plus I'm claustrophobic. When they had me use it during the sleep study, they turned it up to 22 with no gradual increase. This made me even more frantic with having something over my face. Also the pressure was so great that it made my lips blow open and I couldn't keep them shut. I've been using generic Ambien for over 5 years now. If I don't, I don't sleep. You have no idea how it affects you mentally when you can't sleep. It's horrible.