"Regulate your nervous system" has been said so many times it's basically stopped meaning anything. So here's what it actually means. Not staying calm all the time. Your body's ability to shift out of alert mode and into settled mode, on command, specifically the second your head hits the pillow. When that shift gets stuck, no sleep hack touches it. Full video is live in the Free Library of Sleepy & Dreams. Does your brain get louder the moment you lie down and go still, like it's been waiting all day for the chance?