What causes insomnia when your body is exhausted but your brain won’t shut up?

another sleepless night

Physically dead tired. Mentally doing math I don’t care about.

So honestly, what causes insomnia at this point?

Because it’s not stress about tomorrow. It’s not caffeine. It’s just… momentum.

Like my brain learned how to stay on, and now it doesn’t know how to stop.

People say “relax.” Cool. Wish that worked.

If you’ve broken this loop before, what actually changed? Not theory, what flipped?