That week I went digging. Real sleep research. Not supplement blogs.
First shock: the signal isn't melatonin. Melatonin mostly tells your brain it's dark. My brain knew it was dark. Which is why 10mg never stopped the snap-back.
The real signal is physical: a small drop in core body temperature. As true sleep approaches, blood flow opens to your hands and feet. Heat leaves the body. Your core cools by about half a degree.
Your brain reads that drop as the all-clear. Night is safe. Stand down.
For forty years, that signal fired in me automatically. That's why sleep felt like nothing. It was nothing.
Then stress taught my body to stay on alert at night — and the alert state blocks the signal. Warm core. Fast heart. Scanning brain.
No drop, no all-clear. No all-clear, no letting go. And every snap-back taught my body the same lesson: see? Letting go isn't safe.
I wasn't broken. My body was waiting for one input it wasn't getting.
I sat with my laptop and felt vindication and grief at the same time.