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HomeConditionsSleep & InsomniaNarcolepsy
Mental Health Condition

Narcolepsy

To define Narcolepsy: A brain disorder causing overwhelming daytime sleepiness and sudden episodes of falling asleep uncontrollably.

Overview

Description

Narcolepsy is a chronic neurological sleep disorder characterized by excessive daytime sleepiness and recurrent episodes of irresistible sleep. It is often accompanied by cataplexy (sudden loss of muscle tone triggered by emotions), sleep paralysis, and hypnagogic/hypnopompic hallucinations. The condition is caused by dysregulation of the sleep-wake cycle, often due to loss of hypocretin (orexin) signaling in the brain.

Prevalence

Estimated prevalence is about 0.025–0.05% of the population, with onset typically in adolescence or early adulthood.

Age of Onset

Most often begins between ages 10 and 25, but can occur at any age.

DSM-5 Code

347.00

ICD-10 Code

G47.419

By HeyPsych Contributor
Reviewed by the HeyPsych Medical Review Board
Reviewed by the HeyPsych Medical Review Board
Board-certified psychiatrists and mental health professionals
Medical Review Board
Published: August 15, 2025
Last Updated: August 25, 2026
Last Reviewed: August 25, 2026

What Is It?

What Is It?

Real Life

Real Life

Symptoms

Symptoms

Lived Experience

Lived Experience

Comparisons

Comparisons

Real Stories

Real Stories

Often Confused With

Often Confused With

Treatment

Treatment

FAQs

FAQs

This information about mental health conditions is for educational purposes only. If you believe you may be experiencing symptoms of a mental health condition, please consult with a qualified healthcare professional for proper evaluation and diagnosis.

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If you recognize these symptoms in yourself or a loved one, know that help is available. Mental health conditions are treatable, and connecting with a qualified professional can make a significant difference.
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