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Idiopathic Hypersomnia

Idiopathic hypersomnia or excessive daytime sleepiness (EDS) is sleeping too much without an obvious cause such as narcolepsy or other sleep disorders and is believed to be a neurological disorder. It is different from narcolepsy, because idiopathic hypersomnia does not involve suddenly falling asleep or losing muscle control due to strong emotions (cataplexy). It occurs despite normal quality and quantity of night time sleep and is thought to arise from problems with the brain’s systems that regulate sleep and wake.


Symptoms often develop slowly during adolescence or young adulthood. They include:

Other symptoms may include:


Idiopathic hypersomnia is usually treated with stimulant medications such as amphetamine, methylphenidate, and modafinil. These drugs may not work as well for this condition as they do for narcolepsy.

Important lifestyle changes that can help ease symptoms and prevent injury include:

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