Hi,
You check the ration of the exhale and inhale in the machine. I had trials for couple of days, for the first day it was very difficult because the as I exhaled the next pressure for inhale was too much which I was not able to take and my trial went bad that night.
Second day my technican changed the settings of inhale and exhale then it was better.
I hope you need to tweak the machine with a help of a technician while your are sleeping, further you might need a humidefier if you having leak or your mouth is getting drier.
Thanks Daniel