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Living with Kleine-Levin syndrome

A rare condition with repeated episodes of excessive sleep and changes in thinking and behavior, with normal health between episodes.

Understanding Kleine-Levin syndrome

Kleine-Levin syndrome is a rare disorder with repeated episodes of excessive sleep (hypersomnia) along with changes in thinking and behavior.

People may sleep up to 20 hours a day during an episode, and episodes last a few days to a few weeks. They may eat more, be irritable, confused, or have hallucinations. People have no symptoms between episodes. It mainly affects teenage boys but can affect females and other ages. Episodes tend to decrease with age.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Episodes of excessive sleep
  • Eating much more than usual
  • Irritability and agitation
  • Confusion and trouble thinking
  • Headache and light sensitivity
  • Apathy or low mood

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Hypersomnia Foundation and Kleine Levin Syndrome Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists)
Expert care
Expert lists: Hypersomnia Foundation, Kleine Levin Syndrome Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Hypersomnia Foundation and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What tests help confirm Kleine-Levin and rule out other conditions?
How can we stay safe and supported during an episode?
Which sleep specialist should follow my care?

Quick facts

Symptoms usually startfrom Childhood to Adulthood
InheritanceAutosomal Dominant

The cause is unknown. Episodes sometimes follow an upper respiratory infection.

Neurological

Also known as: kleine levin syndrome; kleine-levin hibernation syndrome

Patient organizations

Source: NIH GARD · Kleine-Levin syndromeGARD ID 3117 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Kleine-Levin syndrome.

Explore the Kleine-Levin syndrome blog

Explore research for Kleine-Levin syndrome

Explore actively recruiting Kleine-Levin syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Kleine-Levin syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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