It sounds like it could be either PCS or PTSD.

What do you feel like after you have been awake a few minutes?

Does anything help you feel better? a shower, glass of juice, breakfast, ?

When I experience this kind of wake up, it is usually tied to poor breathing. Sometimes, I am dehydrated. Other times, I have been trying to sleep in a very poor position/posture. An overload the previous day is almost a guaranty of this happening.

I still struggle with this after a decade of trying various things to prevent it. Fortunately, I only struggle with this a few days or so per month. It sometimes goes in clusters. Then, I will be free of it for a week or two, maybe more. But, those days are usually miserable.

I had one of those mornings today. It was not unexpected this time. I overloaded visually watching a football game last night. I could only watch the game at my MIL's house of HD screen. The fast HD motion was a noticeable strain. I told my wife to anticipate me to struggle this morning. It usually takes me a few days to recover.

My best to you.