Question: what are the symptoms and causes of narcolepsy?
Answer: Excessive daytime sleepiness. The primary symptom of narcolepsy is excessive daytime sleepiness. ... 
Hallucinations. Some patients with narcolepsy have vivid hallucinations at sleep onset. ... 
Sleep paralysis. ... 
Disturbed nighttime sleep. ... 
Memory problems. ... 
Sudden loss in muscle tone (cataplexy)