Hello: Sometimes I pull off my mask while sleeping and wake up feeling horrible. My machine (Resmed S9) doesn't have a built-in alarm like I've heard some have. When I pull the mask off, it blows at full power for maybe 10-15 minutes and then shuts off. It doesn't happen as often as when I first got...

Great info, thanks!

Sgt Wilko: I'm looking for some sort of battery backup solution, and I'm not sure if I need a pure sine wave uninterruptable power supply or not. You seemed to know above that Cathy's Airsense would not need a UPC with this feature. I have a Resmed S9 with an H5i humidifier. Do I need a pure sine wa...