Aerophagia is what it's called. When air enters the esophagus and goes into the belly during sleep from too high of a pressure from a CPAP machine. My Bariatric Dr. knew I used a CPAP, and my sleep Dr. knew that I was having Bariatric surgery. Neither of them ever mentioned to me that this is a thing. Well about 2 weeks post-op, after I had lost about 40lbs total, my body getting leaner, the high pressure of my machine started pushing air into my new tiny belly while I slept. After a couple of days waking up to a full belly of air, I started looking online for answers, It was on a Saturday, so I would have to wait till Monday to call the dr. and find out what could be done. They lowered my pressure and it stopped doing this, but I fear it messed up my new stomach a little. And I think the amount it takes to satisfy me is a direct result of this. There's no going back from this now, so I'm just leaving my rant here, and moving on with my plan, and knowing that even though I may be able to eat a bit more than the suggested 4oz max at a meal right now, It's by far less than the overfilled plates that I could put away prior to surgery. ?

You might also look into a dental appliance that adjusts the jaw position which eliminated the need for CPAP altogether. My husband (normal weight) has severe sleep apnea and even with the CPAP has multiple episodes every hour. His doctor referred him to a dentist who specializes in these appliances. They take an impression and make custom covers for the upper and lower teeth and there is a "hook" that holds them together when you sleep. The hook is gradually adjusted to manipulate the jaw forward (process takes a few weeks) and at a sleep study done a year ago his apneic episodes went to 2 for the whole night. This is so cool and has worked so well for him...it is great to be able to travel without the CPAP and he sleeps better than he has in over 30 years.