I came to this site to see if anyone had an answer for ill fitting masks. It doesn't seem like there is an answer. I have been to general sites as well and the complaint by thousands is the ill fitting mask. It's very disappointing someone hasn't figured out a good working, comfortable mask as yet. I've only been on a BiPap machine for a couple of months. I am a mouth breather and a side sleeper. At least once a night, the mask wakes me up vibrating against my face. Every morning, I wake up with terrible pain from the mask jammed up against my nose and cheeks. I use a side sleeper pillow and that helps somewhat. My equipment provider has very nice people, but their job is to push product not spend time with finding a proper fit. Perhaps they know it's just not possible, so they don't want to spend a lot of time with it. I have researched other masks, but there doesn't seem to be many answers. My next attempt will be a $75 insert in the mouth mask. Anyone have a better solution?