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Sleep Disorders: What Is Hypersomnia?
Hypersomnia is a condition marked by excessive daytime sleepiness. People who have hypersomnia can fall asleep at any time; for instance, at work or while driving. They may also have a lack of energy and trouble thinking clearly.
According to the National Sleep Foundation, up to 40% of people have some symptoms of hypersomnia from time to time.
What Causes Hypersomnia?
There are several potential causes of hypersomnia, including:
- The sleep disorders narcolepsy (daytime sleepiness) and sleep apnea (interruptions of breathing during sleep)
- Not getting enough sleep at night
- Being overweight
- Drug or alcohol abuse
- A head injury or a neurological disease, such as multiple sclerosis
- Prescription drugs, such as tranquilizers
- Genetics (having a relative with hypersomnia)
Reviewed by The Sleep
Medicine Center at The Cleveland Clinic.
WebMD Medical Reference provided in collaboration with the Cleveland Clinic
Edited by
Leonard J. Sonne, MD on January 01, 2007
'Portions of this page © The Cleveland Clinic 2000-2006
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Common Treatments for Sleep Disorders
Is Anxiety or Stress Causing Your Insomnia?
Can't turn your mind off when you lay down at night? You may need to be treated for anxiety.
