I have been on a CPAP machine for about 4 years, recently I have been awakened by dry mouth after years of not having that type of problem. The humidifier section of my machine was just replaced , but the issue persists. The sleeping area has not changed. In the past , if I set the humidifier too high, I used to get water in the tube. Now even at the highest setting , I don't get any sign of water in the tube. My equipment supplier switched me to a full mask and the dryness continues. I used a auto-titration machine last week, the pressure was lowered as a result. The lower pressure has not made any difference in terms of dry mouth. Interestingly, when using the auto-titration machine for a week, I did not get any dry mouth. My respiratory therapist checked the pressure in the CPAP machine and she said it was fine. Any suggestions will be welcome.