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Adjective: wakeful  weyk-ful
  1. Carefully observant or attentive; on the lookout for possible danger
    "a policy of wakeful awareness";
    - argus-eyed, open-eyed, vigilant
     
  2. (of sleep) easily disturbed
    "a restless wakeful night";
    - light
     
  3. Marked by full consciousness or alertness
    - waking

See also: alert, awake, shallow, watchful

Encyclopedia: Wakeful