You’re drifting off. Your body feels heavy, your thoughts begin to blur—and then suddenly, you jolt awake. A sharp muscle twitch. A gasp. A rush of alertness that pulls you fully back into consciousness.
If you’ve been jolting awake when falling asleep, this moment can feel unsettling and confusing. Many people worry something is wrong with their body or their sleep. In reality, this is a very common nervous-system response—one that can feel dramatic without being dangerous.
Understanding why these jolts happen is often the first step toward helping the body relax into sleep more smoothly.