Thanks, everyone, for the responses. Some very useful info here! I was not familiar with liners at all, so that's definitely something to explore. I'll certainly try out the various pillow tips. And I'm printing out a list of all the masks you've used successfully to take with me this afternoon. All...

Hi, all. I'm new to the board and only in my fourth week of using CPAP. I sleep on my left side and breathe through my mouth when sleeping. I hardly move at all during the course of the night. I started out with a Quattro full face mask, size M. Because of the side sleeping, the mask would shift a l...