Health A-Z


Clinical Definition

Narcolepsy is a chronic neurological disorder that interferes with a person’s sleep-wake cycle.

In Our Own Words

People who have the sleep disorder, narcolepsy, often fall asleep uncontrollably, even after having adequate sleep. During the day, you may be excessively sleepy and nearly unable to function. Sleep attacks can occur even when narcoleptics are walking, driving or engaged in physical activity.

Symptoms and Side Effects

  • Daytime sleepiness
  • Cataplexy (sudden loss of muscle tone)
  • Disrupted nighttime sleep
  • Hallucinations
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