I've been on apap/cpap since April and have never been able to get my AHI down to below/near 5 over a night (although I do have some periods early in the night that can be down at 3.5-4).
I've looked at sleepyhead data and see that early in the night a pressure of 9-11 keeps things OK, but later in the night/early morning even going up to 17 doesn't stop my hypopnea/apneas.
Over the last several months I've tried many, many settings. My initial setting from April was 6-16 apap and a later titration came to 10 on cpap.
I've had an extremely difficult time with aeorphasia. No matter what my settings, or which of many types of masks I've tried (nasal pillows are the worst, a full face is a bit better, but not much).
At the moment I have my apap set to 10-18 with no flex (flex seems to make my aerophasia worse, either c-flex or a-flex (or c-flex plus when on straight cpap).
When on a wider range of apap (6-14), I tended to be around 11.5 for 90%. The issue I see is more clear apneas. Going 8-14 helped some of the clear apneas and bumped my 90% to 13, making the aerophasia much worse. Oddly, at 10-18 there were more clear apneas.
I can post some data, but having changed settings many times over many months I don't know how useful it is. I cleared my data on the machine and started over last night (saving my original data in sleepyhead).
I'm going to try to stay on 10-18 for a while to see where the data is but find it very, very odd that my dreamstation seems to always go up to just under my max setting, no matter if it is set 5-12, or 10-18.
I should add that even after so many months it is only recently that I could tolerate having the machine on for more than a few hours a night. I can now keep it on 6+ hours most nights.
Thanks in advance for any advice or suggestions.