Narcolepsy is a chronic neurologic condition, which means that it involves nerve cells and chemicals in the brain. With narcolepsy, the brain is not able to control sleep-wake cycles normally. The symptoms can make it hard to do everyday tasks and may impact home, school, or work.
There are actually 2 types of narcolepsy. While all patients with narcolepsy have excessive daytime sleepiness (EDS), the type of narcolepsy you have is based on the symptom of cataplexy (sudden muscle weakness with strong emotion) or can be determined by certain lab testing.