My brain wakes up while my body is still asleep - anyone experience this?

I probably do this more than once, but I usually remember it happening at least once per night. I wake up halfway through the night. I open my eyes and I'm laying there with my brain fully awake. I know where I'm at and what is going on. I know that I was asleep and I'm now awake. I can physically move if I want to, so it isn't like sleep paralysis that I've read about where you can't move and you're still partially asleep. I also "know" that my body is physically still asleep while my brain is awake. I'll have the commonly described "body vibrating" or "skin crawling" feeling all over my body still going on because my body is still in deep sleep while my brain is awake. When I reach over and check my wrist pulse, I presume that my heart is beating very low and I'm either just checking it in the wrong spot or it isn't beating hard enough to feel a full pulse. Sometimes it feels like I'm having odd, vibrating palpitations or something. I've seen where my heart rate goes down into the 40's at night during a home sleep study before. So I'll lay there for a minute or two and not move much and then my heart will basically kick into overdrive and start beating much faster as my physical body wakes up to 'catch up' with the brain that is already awake. It is usually 1-2 minutes in between me waking up and this physically happening with the heart. It is weird as heck.

Cardiologist has done a full Stress Echocardiogram before on me. I went into the office and before any exercise, they took images and viewed my heart in real-time via ultrasound. Then they had me run on the treadmill and get my heart rate up, then checked it again. They said my heart is very strong and healthy and I have absolutely no conditions to worry about. At night, it just feels like my heart does weird stuff while in deep sleep.

Over the past 3-4 months, I have gotten panic attacks out of nowhere, beginning at 37 years old with no known stressors. Previous in-lab study yielded only 5 AHI and 18 RDI, indicative of /UARS. I have one more month before my employer's health insurance kicks in and I can start chipping away at their deductible. One of the first things I'm planning to do is this:

http://axgsleepdiagnostics.com/product/comprehensive-type-2-diagnostic-home-sleep-study-unattended/

They also translate it for you. It is rare to see such a good deal with head electrodes.

A comprehensive Type 2 home sleep study for $500. You hook up your own head electrodes and get to sleep in your own bed. The in-lab study went horribly last time and I just slept a few hours. I may eventually have another in-lab study, as well. I've been worked over for everything that they could do bloodwork-wise. I'm healthy, but I think I have some severe sleep issues of some type, including UARS.

OSA treatments using Air Sense 10 Autoset on 7cm - 10cm settings haven't helped. They take my AHI down from 5 to 0.5, but I have literally woken up with a panic attack before and I haven't worn the APAP since. I have also tried it in CPAP mode. In Oscar, I would typically see a number of apneas, a number of hypopneas, a few central apneas that looked legitimate and also one or two RERAs and something else that I can't think of right now (forgot the other thing that it detects). It may be that I might have some kind of central apnea and might need BiPap for the lowest exhale pressure that the EPR 3 on the Air Sense 10 just can't cut it for. I have read that someone had similar symptoms before and after getting BiPap, they didn't have any more panic attacks and their felt so much better every morning.