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hypersomnia Definition

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hypersomnia
noun(hy-per-som-nia)
a disorder of sleep that is characterized by prolonged nocturnal sleep periods which typically occur at least three times a week, by sleep that is not restorative or refreshing, and by the presence of excessive daytime sleepiness; also : excessive daytime sleepiness not associated with disturbed nocturnal sleep : hypersomnolence

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