Definition: A sudden, involuntary muscle twitch during the transition from wakefulness to sleep (Stage N1 non-REM sleep).
Sensations:
→ Feeling of falling or tripping
→ Brief dream fragment (e.g., stepping off a curb)
→ Full-body jolt or leg/arm twitch
→ Momentary gasp or racing heart
💡 Key fact: Hypnic jerks are not seizures—they’re a misfire in your brain’s sleep-wake transition system.
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