Your friend has experienced excessive daytime sleepiness. He is laughing with you and suddenly falls to the ground. Your friend is probably suffering from

Question

Quizplus · Accepted Answer

Excessive daytime sleepiness followed by sudden sleep attacks is a characteristic symptom of narcolepsy. The sudden collapse is due to a loss of muscle tone that often accompanies narcoleptic attacks.

Your Friend Has Experienced Excessive Daytime Sleepiness