Alright, here's last night:
Tried my best to continue at 5:30 am despite a stuffy nose, but it got almost 100% blocked and I had to take the mask off to go back to sleep (the congestion disappeared within 10-15 min). Anyway, this time I made the effort to write down the time whenever I woke up during the night. At 5:15 am, I recorded waking up while lying on my back. This seems to pinpoint the later cluster of apneas pretty much spot-on. If I'm not tucking my neck and still getting apneas from the occasional half-hours on my back, should I be thinking of increasing the minimum pressure even further?
It seems like there are two separate problems hurting my sleep at this point:
1) Sinuses getting swollen with use of CPAP
I am seeing an allergy doctor today, and will be getting a new mask (DreamWear Full-Face Mask) in the mail shortly.
2) The cluster of apneas that shows up whenever I'm lying on my back, which hasn't been solved by an increase in the minimum pressure (from 5 to 9)