definition of
insomniac

[1] #1 insomniac n. [sleepless person] someone who cannot sleep. wn

[2] #2 insomniac s. [sleepless, watchful] experiencing or accompanied by sleeplessness; "insomniac old people"; "insomniac nights"; "lay sleepless all night"; "twenty watchful, weary, tedious nights"- Shakespeare. wn