I have similar symptoms and everything started shortly after I had Covid two years ago. I fall asleep okay (with Trazodone and melatonin) but wake after 4 hrs of sleep and can't go back to sleep. It feels like my nerves are being stimulated, like the shaky feeling you mentioned. Since your post in Dec 2023, have you found anything that helps you? All doctors recommend are the strong sleeping meds that have a sleep waking side effect, which I'm afraid to take.