Meaning : A periodic state during which you are conscious and aware of the world.
Example :
Consciousness during wakefulness in a sane person is pretty well ordered and familiar.
Meaning : A temporary state in which you are unable (or unwilling) to sleep.
Example :
Accept your wakefulness and sleep in its own contrary way is more likely to come.
Synonyms : sleeplessness
Meaning : The process of paying close and continuous attention.
Example :
Wakefulness, watchfulness, and bellicosity make a good hunter.
Vigilance is especially susceptible to fatigue.
Synonyms : alertness, vigilance, watchfulness