(Archaic) Not sleeping; awake.
someone who cannot sleep
Constantly moving, active, or alert
Find another word for insomniac. In this page you can discover 10 synonyms, antonyms, idiomatic expressions, and related words for insomniac, like: broken sleeper, watchful, sleepless person, victim of insomnia, light sleeper, patient, sleepless, amnesiac, ex-alcoholic and egomaniac.