You can be in bed for 8 hours and still not reach the specific deep sleep phases where this signal activates.
Doctors focus on sleep quantity. Fitness experts focus on exercise. But almost nobody explains what happens when this internal signal fails.
Your body stays in a kind of protective mode, unable to properly organize energy, balance hormones, or complete overnight recovery processes.
This explanation challenges common beliefs about sleep and recovery.
That’s why it’s not always publicly available.