Wakeful; sleepless.
Vigilant; careful; wary; cautious; observant; alert; on the watch: with of before the thing to be regulated or observed, and against before the thing to be avoided: as, to be watchful of one's behavior; to be watchful against the growth of vicious habits.
Synonyms Watchful, Vigilant, Wakeful, attentive, heedful, circumspect, guarded. Wakeful refers to the lack of disposition to sleep, especially at times when one would ordinarily have such a disposition; watchful and vigilant refer to the mind, will, or conduct: they are of about equal vigor; watchful is the broader in its range of meaning.