- 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)
- lidless, sleepless - without having the eyes closed or covered by the eyelids; "to an eye like mine, a lidless watcher of the public weal"- Alfred Tennyson
Antonym: unalert (indirect, via alert)