The devil lies in the details. If you go to apneaboard.com, in the black marquee near the top of the forum page, look right and find 'OSCAR'. That is a glitch-free, safe, freeware program that will read your CPAP machine's daily data and provide you, and us, with a detailed and comprehensive look at how you and your machine interact, and what events and performances you both exchange. You'll need to pull your machine's SD card out two or three times each week and have OSCAR download the latest data. From there, once you learn how to read the chart, you'll quickly see what stands improvement, whether fit of the mask and leaks, flow limits, minute vent, or just the levels needing adjustment, tidal volume, or even EPR (expiration pressure relief, which is often a contributor to centrals if they appear at the commencement of therapy).

The nightly AHI is a composite score of obstructive and central apneas, but it also includes hypopneas. Your physician may be 'fine' with numbers higher than 5, but I don't think it's fine. Remember, that's per hour...and it's only an average computed over the length of hours you slept in total. That means as many as 40 events per night, almost double that for the numbers you claim on the worst nights! What could be 'fine' for sleep as disrupted as yours seems to be?!?! It might be time to look for another sleep specialist, one who isn't content with your 'fine' numbers.