Causes of narcolepsy may be:
- Low levels of hypocretin in the body (type 1)
- Problems that affect the central nervous system, such as multiple sclerosis and birth defects of the brain
The main symptom is excessive daytime sleepiness even when a person has good quality sleep at night. Other problems may be:
- Muscles that go limp without warning when a person is awake (often triggered by strong emotions like laughter)
- Brief times when the person cannot move while waking up or falling asleep
- Sudden attacks of sleep that may happen many times during the day without control
- Vivid dreams that happen while waking up or falling asleep
|Brainstem—Area of Brain Related to Alertness
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The doctor will ask about symptoms and past health. A physical exam may be done.
Tests that may be done to diagnose the disorder include:
- Multiple sleep latency test (MSLT) to assess daytime sleepiness
- Polysomnography to study brain waves and how the body works during sleep
- A lumbar puncture to measure the level of hypocretin around the brain and spinal cord
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
Edits to original content made by Denver Health.
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