Breathing & Heart Rate During Sleep: Normal Physiology vs. Danger
Breathing and heart rate never stop during sleep. They modulate:
- NREM Sleep: ↓ Respiratory rate, tidal volume, HR, BP (parasympathetic dominance)
- REM Sleep: Irregular breathing, variable HR/BP (sympathetic surges), muscle atonia
Complete cessation = apnea (pathologic) or cardiac arrest (fatal). Obstructive/central sleep apnea involves repetitive pauses but not sustained arrest.
If breathing or heartbeat stops, consciousness is lost within seconds; death follows in minutes without resuscitation.
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