I've been on fixed pressure CPAP since 2009 and have never felt completely rested, i.e. 100%. Up until a couple of months ago before I started taking Ambien I would say I felt about 50% rested on a typical day due to it being difficult to sleep wearing the mask.
Now that I'm on the Ambien I can easily sleep 7+ hours straight but still I only feel around 75% rested on a typical day. I feel much better in the morning than I used to (clearer head and more rested), but I still almost always have a mild headache in the morning and never ever feel completely refreshed. I can at least fight through the fatigue and cloudy head now without too much of a problem, but it's not fun.
The last few months I typically see averages of 1.5 to 1.9 AHI on my S9 when I check it after I wake up. Before I started taking Ambien my AHI was hovering around 0.5 - 0.9. I'm guessing that the slightly higher AHI is not the problem, but I did try bumping up my pressure from 6.4 to 7.4 with no noticeable improvement (symptoms or AHI). So I reset it back to my prescribed 6.4.
So in trying to figure this out I have a few questions.
1) Is it possible I'm breathing though the mouth for long periods even though my S9 is reporting (misreporting?) AHI's of under 2? How to check for mouthbreathing?
2) I feel like the Ambien is working very well, but maybe I'm wrong and having mild side (after) effects? Suggestions?
3) Should I go ahead and inquire with my GP about a medication(?) to help clear my head and make me more alert? Or would that be premature?
4) Would having another sleep study be worthwhile? i.e would an experienced sleep specialist be able to pin point the problem or would all they tell me is that my SA is under control?