Hypnic Jerk
A hypnic jerk is an involuntary twitch of one or more muscles that occurs as a person is falling asleep. It tends to happen just as the person is transitioning from a wakeful state to a sleeping state.
A hypnic jerk is an involuntary twitch of one or more muscles that occurs as a person is falling asleep. It tends to happen just as the person is transitioning from a wakeful state to a sleeping state.
