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This content was created by Dr. Charles Mok. This content was uploaded by Dr. Charles Mok. This is a YouTube video titled "What Is Sleep Apnea?" (created Nov 26, 2024) containing a single speaker explaining obstructive sleep apnea: how the airway can collapse during sleep (tongue falling back), definitions of apnea vs hypopnea, how the apnea–hypopnea index (AHI) is measured, and clinical AHI thresholds (normal up to ~4/hour, 5–15 mild, 15–30 moderate, 30+ severe). The excerpt is an explanatory monologue rather than a multi‑speaker conversation.










