Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Narcolepsy ?
    ### Response:
    The four major signs and symptoms of narcolepsy are extreme daytime sleepiness, cataplexy (muscle weakness) while awake, and hallucinations and sleep paralysis during sleep.
                
If you have narcolepsy, you may have one or more of these symptoms.
    