Your friend has experienced excessive daytime sleepiness. He is laughing with you one minute, and snoring the next. Your friend is probably suffering from

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Excessive daytime sleepiness and sudden sleep attacks are hallmark symptoms of narcolepsy, a neurological disorder that affects the brain's ability to regulate sleep-wake cycles. People with narcolepsy often experience sudden bouts of sleep during the day, which can be triggered by strong emotions or inactivity. Additionally, narcolepsy can cause other symptoms such as sleep paralysis and hallucinations during sleep. Parasomnia refers to abnormal behaviors that occur during sleep, such as sleepwalking or night terrors. REM rebound is the phenomenon of experiencing more REM sleep than usual after a period of sleep deprivation or suppression. Sleep apnea is a condition involving interruptions in breathing during sleep, often caused by obstruction of the airway. While sleep apnea can cause excessive daytime sleepiness, it does not typically cause sudden sleep attacks like those seen in narcolepsy.

Your Friend Has Experienced Excessive Daytime Sleepiness