Does your body ever start to twitch at night, right as you’re about to lose consciousness and go to sleep?

Don’t worry, you have nothing to fear. Roughly 70% of the world’s population get this. This is known as a “hypnic jerk” or “sleep start,” an involuntary jerk of the legs, arms and body. Basically, two systems in your body are fighting each other. They are both trying to battle over whether your system should stay alert and maintain control of your body. Meanwhile, the other system tries to ignite your sleep cycle.

For more information, check out the YouTube channel SciShow.

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