Hey Kat, thanks for the response. Should've mentioned the unit I have is called the Respironics C-Flex. Sounds like your unit has a similar technology. Took a while to dial in the flow rate and ramp time, but once that was done and combined with the Ambien to deal with insomnia issues I'm a different guy. There's no 'barbituate hangover' either. Longterm studies have yet to be done in terms of side effects, but I'll take a good nights sleep and my chances unless something 'very' serious turns up. Have to monitor my exercise and food intake pretty closely. Need 5-6 hours after heavy meals or exercise before trying to sleep as part of insomnia is related to heightened metabolism whether or not it's anxiety driven. I remember complaining in my TEENS! about being tired and it was, sort of dismissed by my family as staying up too late, etc. So, this isn't an age/weight problem. Low frustration threshold, tiredness, road rage, impatience...I've had 'em all. Nevermind what the apnea may have been doing to my immune system. Much of it due to a lack of proper REM sleep. My girlfriend(who's a physical therapist and diagnosed my disorder)says a 'pleasant alien' has inhabited my body in the last month and she wants it to stay. Anyway, it's estimated as high as 30% of the population suffers from this disorder. Good for you on your weight loss as it can only contribute to overall quality of life. Keep going!   Jeff