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Hypnic Jerk: Why You Twitch When You Sleep

Hypnic jerksalso known as sleep startsare sudden, involuntary muscle twitches that occur as youre falling asleep. They often feel like a jolt or a falling sensation.

Doctors suspect that as youre falling asleep, a misfire sometimes occurs between nerves in the reticular brainstem, creating a reaction that leads to a hypnic jerk.

While they can be surprising, hypnic jerks are common and generally harmless, though they may be more frequent during times of stress, fatigue, or excessive caffeine use.

https://www.sleepfoundation.org/parasomnias/hypnic-jerks