Why Do People 'Twitch' When Falling Asleep?

The phenomenon, known as a hypnogogic jerk, is named in reference to the hypnogogic state — the transitional period between wakefulness and sleep. Hypnagogic jerks are also commonly known as hypnic jerks or sleep starts.



via LiveScience.com http://www.livescience.com/39225-why-people-twitch-falling-asleep.html