My guess.
You have obstructive apnea which causes you to stop breathing. Your body realizes to o2 levels are going down, so it kicks you out of REM sleep, then it wakes you via small dose of adrenaline so your conscious mind takes over and modifies the air passages so you breathe once again. Your body is reluctant to go back into sleep , as it feels there is danger you need to be awake for, so you make be awake for a few hours or until you relax enough to clear the adrenaline.
That is my going theory as well. I have not had time to do a sleep study for a lot of reasons but im going to try to do one this summer.
Worse case, go one ebay and buy a resmed autosense 10 , and get the resmed pillows . Try it for a night. It autodetects if you stop breathing and bumps the pressure up to compensate. Make sure you look at the hours and get the lowest one. Last few I've bought were 200-500 bucks, which is cheaper than my yearly deductible. New they are 1500-2000.
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