I sleep through the night most of the time, but air leaks are still an ongoing issue for me. Sometimes they wake me up, most times they don't.
I have found a few things that might be helpful to you.
If you are having a big enough leak to make the loud flapping sound, then perhaps your mask is either not fitted properly or else just not seated properly.
.. proper fit: first make sure the headgear is properly positioned the way you did when you first fitted it. Be sure you don't have any twists in the straps. Try going through the fitting drill again. Put the machine in mask fit mode, loosen until it leaks and readjust the straps until you don't get the flapping leak. Remember to keep the tension even on both sides. You want to eliminate the leak but not cinch it down so tight that you feel hard plastic against your face. Don't want them too tight, most FFM use air cushion to allow the silicone to expand to the contour of your face. Then lay down in your usual sleep position and if needed adjust straps again. You might have to play with it a few times to find the sweet spot for strap tension. There is good info on youtube if you google your mask name and fitting tips or similar search.
.. not seated properly: here's a tip I got from PaytonA... this is helpful after you have your mask adjusted, just to make sure it is properly seated. You can do this when you first put it on each night, or if you move around and cause a leak. You do it while the machine is on and there is air pressure. Pull the mask completely away from your face so the air flows freely, and then release it gently to let it reseat naturally on your face to allow the air cushion to reform the seal. Sometimes just doing this can make leaks go away.
.. Over time I have also found that if I wake up with an air leak or notice one as I am drifting off, I can either wiggle my jaw back and forth a little or else grip the hard plastic above the nose to slightly adjust the position to allow the mask to reseat just that little spot where it was leaking. Then go back to sleep.
One other thing I have noticed is clean mask and face make a better seal. Just that little bit of face oil that naturally occurs overnight can build up on the silicone so it won't form an air seal with the skin anymore.
.. A quick wipe with some tissue moistened with foaming hand soap, then wipe clean with moist tissue, then dry it with a dry tissue, helps to freshen up the mask and keep a better seal in between full cleanings.
.. I guess best practice is probably to wash the mask every day but I haven't achieved that discipline (and maybe that's a reason why I still struggle with leaks).
[quote='SaldusMiegas' pid='124970' dateline='1438618172']
Great tips ! I will try them real soon . Your guides on Face Mask maintenance are very helpful . Thanks..