WordNet (r) 3.0 (2006):
insomniac adj 1: experiencing or accompanied by sleeplessness; "insomniac old people"; "insomniac nights"; "lay sleepless all night"; "twenty watchful, weary, tedious nights"- Shakespeare [syn: insomniac, sleepless, watchful] n 1: someone who cannot sleep [syn: insomniac, sleepless person]