Why You Feel Like You're Falling Asleep (Hypnic Jerk)
Ever jolted awake just as you were drifting off — like you missed a step or fell off a cliff? That's called a hypnic jerk (or "sleep start"), and almost everyone experiences it. But why does it happen? In this video we break down the science behind that sudden twitch: what's happening in your brain as you fall asleep, why your body reacts like you're falling, and the leading theories — from an ancient survival reflex left over from sleeping in trees, to your nervous system misfiring during the shift into sleep. ⏱️ TIMESTAMPS 00:00 The 2am jolt 00:35 What is a hypnic jerk? 01:20 What happens in your brain 02:10 The "falling" sensation explained 03:00 The ancient-survival theory 03:50 Should you worry about it? 04:30 How to reduce them 🔔 Subscribe for more simple answers to weird body questions. #hypnicjerk #sleep #brain #science #bodyfacts #biology #health
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