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Adjective: sleepless  sleep-lus
  1. Experiencing or accompanied by sleeplessness
    "lay sleepless all night";
    - insomniac, watchful
     
  2. Always watchful
    "to an eye like mine, a sleepless watcher of the public weal";
    - lidless

See also: alert, awake, watchful

Encyclopedia: Sleepless