- 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)
- insomniac, sleepless person - someone who cannot sleep
--1 is a kind of sick person, diseased person, sufferer