Why does your body suddenly jerk or feel like you're falling when you're asleep?
Sometimes, when you're drifting off in a hazy state but not yet fully asleep, an illusion occurs: you feel as if you've stepped into empty space and are falling from a height. Startled, your whole body twitches or your leg kicks out, and when you wake up you find it was just a false alarm.
Why do people...

Sometimes, when you're drifting off in a hazy state but not yet fully asleep, an illusion occurs: you feel as if you've stepped into empty space and are falling from a height. Startled, your whole body twitches or your leg kicks out, and when you wake up you find it was just a false alarm.
Why do people suddenly jerk awake while sleeping?
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