Source : WordNet®

wake up
     v 1: cause to become awake or conscious; "He was roused by the
          drunken men in the street"; "Please wake me at 6 AM."
          [syn: {awaken}, {wake}, {waken}, {rouse}, {arouse}]
          [ant: {cause to sleep}]
     2: stop sleeping; "She woke up to the sound of the alarm clock"
        [syn: {awake}, {arouse}, {awaken}, {wake}, {come alive}, {waken}]
        [ant: {fall asleep}]