Adjective insomniac has 1 sense
  1. insomniac, sleepless, watchful - experiencing or accompanied by sleeplessness; "insomniac old people"; "insomniac nights"; "lay sleepless all night"; "twenty watchful, weary, tedious nights"- Shakespeare
    Antonym: asleep (indirect, via awake)
,Noun insomniac has 1 sense
  1. insomniac, sleepless person - someone who cannot sleep
    --1 is a kind of sick person, diseased person, sufferer
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