Dude, this is exactly me. Same age. 4.5 hours. Read for a while. 1-2 hours more.

Just this morning, I think I finally diagnosed my central sleep apnea. I was laying there and just as I fell asleep I started awake because I wasn't breathing. My diary has notes about this happening all the way back to last March. This happened to me after my first sleep.

To add to that, I've become hyper-sensitive to caffeine. It causes palpitations (started in late 2019).

I don't snore, but I have been using Breathe Right strips to make sure I have adequate air flow, and so I'm really sure I don't snore. Curiously, I haven't used them for a couple of weeks (long story).

EDIT: if you want to contact me, my info is in my profile