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

See also: alert, awake, shallow, watchful

Encyclopedia: Wakeful