سوال؛
علت ضربه ناگهانی یا تکون خوردن یهویی بدن‌ موقع‌ خواب چیه؟

پاسخ؛
Hypnic jerks are involuntary muscle contractions that some people experience as they fall asleep.

They are a type of sleep myoclonus and may feel like muscle 1 twitches or a falling sensation. They can be spontaneous or triggered by external stimuli and may be accompanied by a rapid heartbeat, quickened breathing, sweat, or a vivid dream experience 5. They are more common in people with irregular sleep schedules.

یک انقباض غیرارادی یک یا چند عضله است که هنگام به خواب رفتن فرد رخ می دهد. که در مرحله خواب REM رخ می دهد.