When Larry was a teenager, he began experiencing periods when he had a lot of trouble staying awake during the day, even though he was getting enough sleep each night. He also would experience sudden "attacks" where he would collapse to the floor in the middle of an activity. Larry suffers from:

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Larry's symptoms are classic signs of narcolepsy, which is a neurological disorder that affects the brain's ability to regulate sleep-wake cycles. People with narcolepsy often experience sudden attacks of sleepiness during the day and may fall asleep unexpectedly or at inappropriate times. They may also experience other symptoms such as cataplexy (sudden loss of muscle control), sleep paralysis, and hallucinations. Sleep apnea and insomnia are sleep disorders that involve difficulty with falling asleep, staying asleep, or getting enough quality sleep, but they do not typically involve sudden attacks of sleepiness or collapse. REM behavior disorder (RBD) involves acting out dreams during REM sleep, but it does not typically involve excessive daytime sleepiness.

When Larry Was a Teenager, He Began Experiencing Periods When