FFM Cushion moving during sleep?

[raisedfist]

I am using the F&P Vitera FFM and it fits great when I lay down ready for bed. At some point during the night, although I make a point to try and not toss and turn or change my position, the cushion seems to "slip" a bit. Is this probably due to the jaw dropping? If so, any way to address this aside from using another mask that seals under the chin?

[zonker]

I am using the F&P Vitera FFM and it fits great when I lay down ready for bed. At some point during the night, although I make a point to try and not toss and turn or change my position, the cushion seems to "slip" a bit. Is this probably due to the jaw dropping? If so, any way to address this aside from using another mask that seals under the chin?

perhaps a chinstrap or (my preference) a firm foam cervical collar?

[Okie bipap]

Back before I started using a foam cervicle collar, I would run two pieces of tape from the mask down to under my chin. This would keep the mask cushion in place.

[Muse-Inc]

Make sure face and mask are free if oil before putting mask on. In my case, any oil prevents a good seal.