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An inability to stay awake
Answer for the clue "An inability to stay awake ", 11 letters:
hypersomnia
Word definitions for hypersomnia in dictionaries
WordNet
Word definitions in WordNet
n. an inability to stay awake [ant: insomnia ]
Wikipedia
Word definitions in Wikipedia
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.
Wiktionary
Word definitions in Wiktionary
n. (context medicine pathology English) Excessive sleepiness.