in·som·ni·ac inˈsämnēˌak/ noun noun: insomniac; plural noun: insomniacs 1. a person who is regularly unable to sleep. "I'm a terrible insomniac, I often write from four in the morning to seven" adjective adjective: insomniac 1. regularly unable to sleep. "as the host of an all-night radio show, Shepard would commune with his insomniac listeners"
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