Thanks for all your nice responses and good advices. I was quite surprised that switching from a nasal mask to a full face mask helped but didn't resolved the issue. I am trying to wait but waking up 7 to 10 times a night is not a great experience

It didn't help me

Good evening. I had open heart surgery a month ago and was put on beta blocker. I am doing pretty well except for the sleep. Since then more or less, I have incredibly dry mouth. I could barely open my mouth while I was using a nasal mask (mirage FX wide) (which I have used successfully for about 10...