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