Etymology
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insomniac

1877 (adj.); 1879 (n.), from insomnia. Earlier was insomnious (1650s).

updated on December 13, 2015

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Definitions of insomniac from WordNet
1
insomniac (n.)
someone who cannot sleep;
Synonyms: sleepless person
2
insomniac (adj.)
experiencing or accompanied by sleeplessness; "twenty watchful, weary, tedious nights"- Shakespeare;
insomniac nights
insomniac old people
Synonyms: sleepless / watchful
From wordnet.princeton.edu, not affiliated with etymonline.