Narcolepsy is a sleep disorder defined by constant sleepiness and a tendency to sleep at inappropriate times.  Typically, a person with narcolepsy suffers sleep attacks as well as continual sleepiness and a feeling of tiredness that is not completely relieved by any amount of sleep.

The four most common symptoms of narcolepsy are:

• Excessive daytime sleepiness
• Cataplexy (sudden loss of strength in the muscles)
• Sleep paralysis
• Hypnagogic hallucinations (hallucinations that occur just before falling asleep, during a naps, and/or on waking up)

-AASM