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Narcolepsy is a chronic neurological condition that disrupts the normal sleep-wake cycle. People with this sleep disorder can experience overwhelming fatigue and uncontrollable sleepiness; they nap or fall asleep often throughout the day and can lapse into fully unplanned sleep at any time. They may also take multiple "micro-naps," lasting just a few seconds at a time. During severe bouts of sleepiness, they may continue with their normal activities in a kind of automatic state, but may feel dazed and have no memory of engaging in the activity.