Usually means: Security personnel working overnight shifts.
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We found 3 dictionaries that define the word nightguard:

General (2 matching dictionaries)
  1. nightguard: Wiktionary
  2. nightguard: Dictionary.com

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (nightguard)

noun:  (dentistry) A guard worn on the teeth to prevent damage from bruxism during sleep.

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