What is the meaning of wakefulness?

noun

• A periodic state during which you are conscious and aware of the world.
  • usage: "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.
  • usage: "accept your wakefulness and sleep in its own contrary way is more likely to come"
  • synonyms: sleeplessness
• The process of paying close and continuous attention.
  • usage: "wakefulness, watchfulness, and bellicosity make a good hunter"; "vigilance is especially susceptible to fatigue"
  • synonyms: watchfulness, vigilance, alertness