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Wiktionary
hypersomnia

n. (context medicine pathology English) Excessive sleepiness.

WordNet
hypersomnia

n. an inability to stay awake [ant: insomnia]

Wikipedia
Hypersomnia

In the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders, published in May 2013, hypersomnia appears under sleep-wake disorders as hypersomnolence, of which there are several subtypes.