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Published on: 7/9/2025

What are possible causes for my body to randomly jerk?

Random body jerks may be caused by hypnic jerks, which are common and usually occur as you fall asleep.

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Explanation

Hypnic jerks, also known as sleep starts, are sudden muscle twitches that often occur as a person is falling asleep. These jerks are common and typically harmless, although they can sometimes be strong enough to wake you up or disturb your sleep.

What Are Hypnic Jerks?

  • Timing: Usually occur when you are just about to fall asleep.
  • Feeling: It may feel like a sudden jump or twitch in your body.
  • Frequency: Many people experience them occasionally, and they are generally not a cause for concern.

Why Do They Happen?

The exact reason for hypnic jerks is not fully understood, but they are thought to be a normal part of the transition from wakefulness to sleep. Some factors that may increase the likelihood of experiencing hypnic jerks include stress, fatigue, and caffeine intake.

If these jerks are causing significant sleep disruption or concern, it may be helpful to discuss them with a healthcare provider to rule out other potential causes.

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