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Definition of sleepless:

  1. Having no rest; perpetually agitated.
  2. Having no sleep; wakeful.

Synonyms:

wakeful, on the lookout, lidless, awake, alert, cautious, wide-awake, careful, vigilant, wary, insomnious, slumberless, awareness, circumspect, restless, insomniac, watchful, on the alert.

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