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Definition of Insomniac
1. Noun. Someone who cannot sleep.
2. Adjective. Experiencing or accompanied by sleeplessness. "Twenty watchful, weary, tedious nights"
Definition of Insomniac
1. [n -S]
Medical Definition of Insomniac
1. 1. A sufferer from insomnia. 2. Exhibiting, tending toward, or producing insomnia. (05 Mar 2000)