
Excessive daytime sleepiness (EDS) is characterized by persistent sleepiness and often a general lack of energy, even after apparently adequate or even prolonged night time sleep. EDS can be considered as a broad condition encompassing several sleep disorders where increased sleep is a symptom, or as a symptom of another underlying disorder like n...
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http://en.wikipedia.org/wiki/Excessive_daytime_sleepiness

Excessive daytime sleepiness: A neurological disorder in which there is a sudden recurrent uncontrollable compulsion to sleep. Excessive daytime sleepiness is also known as narcolepsy. The condition is often associated with: Cataplexy -- a sudden loss of muscle tone and paralysis of voluntary muscles associated with a strong emotion Sleep paralysis...
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http://www.medterms.com/script/main/art.asp?articlekey=10472
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