TB_04_73_Sleep_Apply_LO 4.6, APA 1.1, 1.3Your friend has experienced excessive daytime sleepiness. He is laughing with you and suddenly falls to the ground. Your friend is probably suffering from ________.

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Excessive daytime sleepiness and sudden uncontrollable episodes of sleep are characteristic symptoms of narcolepsy, a sleep disorder caused by a dysfunction in the brain's ability to regulate sleep-wake cycles. The sudden falling to the ground (cataplexy) is also a common symptom of narcolepsy. Parasomnias involve abnormal behaviors during sleep, REM rebound refers to increased REM sleep after sleep deprivation, and sleep apnea causes interruptions in breathing during sleep but does not typically result in sudden falls to the ground.