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/ɪnˈsɒm.ni.æk/ · noun
One who suffers an inability or difficulty sleeping; a sufferer from insomnia..
Use insomniac when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Insomniac means One who suffers an inability or difficulty sleeping; a sufferer from insomnia..
Common synonyms include watchful, sleepless, sleepless person.
The opposite depends on the specific sense.
Use insomniac where its definition matches the intended context.
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