I'm guessing here but from what you describe it sounds like what bothers me. You sleep a bit and have a episode, wake enough to feel like you can't get air. My fix was to turn off heat and humidity completely and put distilled water made ice in the reservoir. The cold air let's my brain feel that air is coming through. Helps until the ice melts but gives me some better sleep. Why cpap companies think everyone wants or can breath hot air baffles me.