An individual suddenly falls asleep in the middle of the afternoon. The sleep cycle begins with REM rather than stage 1 sleep. Most likely, this person has

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Narcolepsy is characterized by excessive daytime sleepiness and abnormal REM sleep patterns, including entering REM sleep almost immediately after falling asleep, which is unusual compared to the normal sleep cycle that starts with stage 1 sleep.

An Individual Suddenly Falls Asleep in the Middle of the Afternoon