Hello, is their anything besides sleep apnea that could be causing me not to get the much needed sleep i so desperately need? I ve been using the CPap for about 6 years now. My pressure has been change 4 times but i still wake up super tired. In my good days i actually wake up rested, but after a couple of hours of being awake my energy levels are drained and i get really tired but can go to sleep. Im like a zombie not wanting to do anything but try to sleep. Any advise is greatly appreciated.