Narcolepsy is a neurological disorder that causes inability to have normal patterns of being awake and asleep. People with narcolepsy can experience excessive daytime sleepiness, sudden sleep, sleep paralysis, hallucinations and in some cases loss of muscle control (also known as cataplexy). These symptoms can cause impairment of daily activities due to the inability to stay awake.

A study in Cephalgia (2003) found migraine prevalence 44.4% in women with narcolepsy and 28.3% in men with narcolepsy.1