Yes, technically an AHI< 5.0 is supposed to be ok.
But this is the second day of detailed data with your pressure set 4-10 that shows a significant cluster of events between 5 and 6 in the early morning.
Here's what the cluster for Oct 1 looks like:
Almost all of your events for the night of Oct 1 occur in this one 25 minute period from 5:25 to 5:50.
The data for September 29 looks similar: Almost all the events occur in a 10 minute window between 4:08 and 5:08:
During both of these significant clusters of events, your pressure is maxed out at 10 and the machine can't respond to try to nip the cluster in the bud and prevent it from happening. In today's data, the machine is also having to ramp all the way up from about 5.3cm to 10cm in a 4 minute period. The machine might have done a better job of preventing this set of events if the minimum pressure were slightly higher.
Does the data for September 30 also have that same kind of nasty cluster of events sometime between 5:00 and 6:00 AM?
Now in all seriousness, if this were happening now and then in my my own data I'd just write it off to Pugsy's gremlins: Sometimes we do have a bad night. But I think this has happened every night since you reduced reduced your pressures to 4-10.
And if
almost all your events are occurring in one bad small stretch of time
and that bad cluster is happening at roughly the same time every day, that indicates
something is happening at that time and that dealing with the
something is probably worth doing in the long run.
So first the obvious questions: Do you tend to wake up around 5:00 or 5:30 am and drift in-and-out of sleep most days? Do you tend to flip onto your back around then? Or (as I think is likely) is this a prolonged REM cycle and your apnea is simply worse in REM?
If this were my data and I was seeing that kind of a nasty cluster at roughly the same time every night, I'd be looking at seeing if a modest increase in pressure might prevent at least some of the events in the nasty cluster.
In other words, I think long term you may need to increase both your
minimum and
maximum pressure settings a bit to prevent and/or break up these clusters of events that seem to occur every night sometime between 5:00 and 6:00 AM.
In the short term, I'd suggest using a pressure range of 5-11 cm for the next 3-5 days to see if you are still getting a nasty cluster of events every day between 5:00 and 6:00am. Obviously, however, if the aerophagia appears even with such a modest increase in pressure, then you'll probably need to abandon the experiment and try again after another week or so of using 4-10 for your pressure range.