Narcolepsy is a condition in which a person has overwhelming sleepiness during the day. Someone with narcolepsy may uncontrollably and unexpectedly fall asleep, even in the middle of activities such as eating or talking. Those with narcolepsy are at high risk of injury when they become sleepy.
Narcolepsy is caused by a disturbance in the natural sleep-wake cycle within the brain, and it can last a lifetime. In addition to daytime sleepiness, people with narcolepsy also have poor sleep at night. They often wake up at night and are unable to go back to sleep. It’s important to note that people with narcolepsy do not necessarily sleep more in 24-hours than those without the condition.