Meaning of wakefulness

(noun) a periodic state during which you are conscious and aware of the world; "consciousness during wakefulness in a sane person is pretty well ordered and familiar"

a temporary state in which you are unable (or unwilling) to sleep; "accept your wakefulness and sleep in its own contrary way is more likely to come"

the process of paying close and continuous attention; "wakefulness, watchfulness, and bellicosity make a good hunter"; "vigilance is especially susceptible to fatigue"