noun (n)

• a periodic state during which you are conscious and aware of the world(noun.cognition)

  Example:
  Consciousness during wakefulness in a sane person is pretty well ordered and familiar.
  

  source: wordnet30
• a temporary state in which you are unable (or unwilling) to sleep(noun.state)

  Example:
  Accept your wakefulness and sleep in its own contrary way is more likely to come.
  

  Synonym:
  sleeplessness
  Antonym:
  drowsiness, sleepiness, somnolence
  

  source: wordnet30
• the process of paying close and continuous attention(noun.cognition)

  Example:
  Wakefulness, watchfulness, and bellicosity make a good hunter.
  

  Synonym:
  alertness, vigilance, watchfulness
  

  source: wordnet30