Did you ever have a proper overnight polysomnography? They may not be everyone's cuppa, but they're the gold standard for finding out what is wrong with your sleep. This includes REM disorder, restless leg syndrome, bruxism (teeth grinding), somnambulance, and so on. There is more to sleep than just maintaining a splinted airway all night long.

I'm glad you don't have centrals. BTW, over at apneaboard.com, in the black marquee at top, most of the way to the right, see OSCAR. That is a freeware (very carefully engineered, monitored, reviewed, revised, and kept free from outside 'influences') that you can download from the site and use on your computer. It will read the SD card in your CPAP machine as often as you wish to have it done. Once you learn what it offers in the way of data, and you'll be amazed (don't allow yourself to be put off or dismayed...there's a LOT there...) you can even fiddle gently, and in tiny increments or decrements, with your settings to fine tune your treatment. We encourage everyone to do that, if only to become familiar with their prescription in a more concrete way, but also to take full command of it. Little tweaks can sometimes mean substantial improvements in daily AHI reports, even dropping an AHI of 3/4 down to 1.5. This means halving the number of events of all kinds....EACH HOUR!! I don't meanta brag, but....my AHI over the past six years has run around 0.5 events. I don't know how I got so lucky, but I'll happily take it. Mind you, I had to pay with atrial fibrillation first. It was the result of my three/four years of undetected 'severe' sleep apnea. My heart was paying the price...all night long...for years.