Part 1: The Strange Sensation Almost Everyone Experiences
5Have you ever been drifting off to sleep when suddenly your entire body jerks, your legs kick, or your arms twitch unexpectedly? Many people describe the sensation as feeling like they were falling from a height, tripping over something, or losing their balance.
This phenomenon is known as a hypnic jerk, sometimes called a sleep start. It typically occurs during the transition between wakefulness and sleep. Although it can feel alarming, it is generally considered a normal part of the sleep process.