Ya, good ol sleep apnea, I went for the sleep test, just a mild to moderate case. I tried the full face mask, for 3 weeks, forget it, most I got was an hour and a half, went back and tried the nose only mask. Even with reduced pressure and no warmth enabled, it was a fight to go more than 2 hours. The funniest thing I experienced 2 times was a bit of overpressure, maybe forgot to exhale and the air went in to my stomach, woke up in a fit, farting and burping like a wild man, darn near hurled up two days of food. That was the end of my trial. I got off the night shifts, got a tempure pedic mattress and feel a whole lot better.