It’s like we feel like we’re falling
In: Biology
This is common and it has a name: a hypnic jerk or hypnagogic jerk.
Kind of crazily, scientists don’t actually know why this happens. It happens more with stress, caffeine, or evening exercise, but we don’t know why it happens to begin with. One theory suggests it’s an old primal instinct related to really not wanting to fall out of tree branches when our ancestors lived (and napped) there, but there’s no consensus on that or any other proposal on why it happens. Could just be a random side effect of the way the body shuts down to sleep. More info here:
[https://en.wikipedia.org/wiki/Hypnic_jerk](https://en.wikipedia.org/wiki/Hypnic_jerk)
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