why does the body do a quick “jerk” or give the brain the feeling of falling for a second while trying to sleep?

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why does the body do a quick “jerk” or give the brain the feeling of falling for a second while trying to sleep?

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As far as I’ve seen, it’s a weird holdover from our evolutionary ancestors that slept in trees. It stands to reason that it would be beneficial to become alert if you have a sensation of falling while about to sleep. Although I really can’t explain why we get the sensation while perfectly stationary on a bed, but I’m not sure that has been explained by anyone.

In addition to the comment above, when falling asleep your body sometimes gets worried you’re actually dying instead of falling asleep. So it sends a signal through your body to jerk awake, just to check you’re still alive