What is that startle reflex that makes you jump or twitch awake?

1 Answer

Answer :

I think you’re referring to the “hypnic jerk” reflex. This happens during the transition from wakefulness to sleep, aka hypnagogia. Since the a typical night’s sleep cycles through around four periods of light wakefulness, there are several such transitions. The hypnic jerk reflex seems to be related to stress.

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