Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Narcolepsy ?
    ### Response:
    Narcolepsy is a chronic neurological disorder caused by the brain's inability to regulate sleep-wake cycles normally. At various times throughout the day, people with narcolepsy experience irresistable bouts ofsleep. If the urge becomes overwhelming, individuals will fall asleep for periods lasting from a few seconds to several minutes.
    