Thanks for the encouragement and advice. I'll go back to mask fitting school and see if that helps. When switching to a new mask it seems that everything is fine for 2 to 4 nights. After that the air leaks get progressively worse each night. I don't change the straps from the original fit and yet th...

I am having trouble finding a mask that consistently stays sealed all night long. I have a bilevel machine and my pressure settings are 21 and 15. I have tried three different ResMed masks, F10, F20, and F30, and the Fisher-Peykull Simplus. Each one works part of the time, but none work full time. I...