definition of
wakefulness

[1] #1 wakefulness n. 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". wn

[2] #2 wakefulness n. [sleeplessness] 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". wn

[3] #3 wakefulness n. [watchfulness, vigilance, alertness] the process of paying close and continuous attention; "wakefulness, watchfulness, and bellicosity make a good hunter"; "vigilance is especially susceptible to fatigue". wn