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Adjective: watchful  wóch-ful
  1. Engaged in or accustomed to close observation
    "caught by a couple of watchful cops";
    - alert
  2. Experiencing or accompanied by sleeplessness
    "twenty watchful, weary, tedious nights";
    - insomniac, sleepless

See also: argus-eyed, awake, fly [Brit], heads-up, lidless, lively, open-eyed, sleepless, vigilant, wakeful, wary, wide-awake

Encyclopedia: Watchful