Thanks for all the data.
The overall picture of the night does show your pressure is increasing during time periods when it looks like you are stuck in sleep transition, unable to fully fall asleep, but your breathing is ragged enough that the machine thinks you're having hypopneas while asleep. In particular the pressure increases between 2:40--2:50, 6:10-6:20 and between 6:30-6:45 probably happened while you were tossing and turning and may have increased the tossing and turning.
It looks to me like you may have fallen asleep as early as around 23:35-23:40, but it might not have been until sometime between 23:50 and 0:05. If I had to guess, I'd say you probably were asleep by 23:40. The first couple of events may be sleep transitional. The events between 23:45-0:05 are really hard to interpret. If you had already started tossing and turning, they might be SWJ, but the breathing around them is pretty stable, so they may be real events. I'd lean towards saying they're real. It's probably too early for the first REM cycle.
The pressure increase in response to the events around 23:50-0:05 doesn't wake you up enough to make you turn the machine off and back on. So my guess is that you are indeed pretty sound asleep by 23:50. The snippet of zoomed in breathing for this time frame posted in https://1drv.ms/i/s!AgFs7hWqVGNflX-8HOhvTG--gg9f looks to me like its nice stable sleep breathing. There may be an arousal at 0:21:50, but its short lived and you return to nice stable sleep breathing. Breathing remains pretty stable (except for the scored events) throughout the rest of the first CPAP session. My guess is that you are in stable sleep pretty much all the way from around 23:35 until you wake up enough to turn the machine off around 2:05. That first CPAP session lasts for about 2 1/2 hours. That's more than enough time for a full sleep cycle. Maybe even enough for most of a second sleep cycle. It could be that the wake at 2:05 came after a second REM cycle that started a bit sooner than expected.
You reported that after the first wake the restlessness started. The next CPAP session is only 30 minutes long. You probably did doze off during this time, but you clearly didn't get into a stable sleep during this session. That's why I didn't ask you for any zoomed in snippets from this session.
The third CPAP session starts around 2:50. The breathing snippet in https://1drv.ms/i/s!AgFs7hWqVGNflgCg7cqvB-DLfr57 is pretty typical of sleep transition breathing. My guess is the CAs at 2:54 and 2:55 along with the H at 2:56 are all sleep transitional. I think you are asleep by 2:57.
Around 3:09:45 weird breathing sets up: You have a patch of 6 H's that are spaced at roughly 45 second intervals in a breathing pattern that gets flagged as periodic breathing. The funny breathing continues after the last H for another 6 minutes or so, although there is only one event scored during these 6 minutes (an OA at 3:16:40 that looks to me like it might be a "potential CA" that was mis-scored as an OA.) The breathing pretty much settles down by 3:19, although there's still a bit of periodicity that continues at least until 3:27. Perhaps you are tossing and turning and starting to drift in and out of sleep at the time the weird breathing pattern sets up around 3:16:40. Or your body had a bit of trouble regulating the the CO2 levels, but a full fledged CO2 undershoot/overshoot cycle did not materialize.
At any rate, the machine increases the pressure in response to those 6 Hs. Again, you don't seem to wake up enough to turn the machine off and back on, but given that there's a whole string of events that start by around 3:40 and continue until you turn the machine off and back on around 5:50, I wonder if you already are doing some serious tossing and turning by 3:40. Having said that, I'll add this: I don't think you were awake this whole time. I think there is some sort periods of real sleep mixed in with some SWJ breathing from tossing and turning. But unless I went through the whole session, I can't tell how much sleep is mixed in with SWJ. In other words, during this session, I think there is some evidence that you are having trouble staying soundly asleep. But the fact that you're not soundly sleeping here is probably enough to explain why the aerophagia was again a problem.
So where to go from here?
When you are willing to do an experiment with the trazadone, I think that's worth doing. If it makes it easier for you to stay asleep during the night instead of waking up tossing and turning, then you'll be able to figure out if controlling the restlessness is going to be a critical part of keeping the aerophagia under control. (How to keep the restlessness under control is another question given that you don't like taking the trazadone.)