watchful

/'wɔtʃful/
Adjective
  1. experiencing or accompanied by sleeplessness
    • insomniac old people
    • insomniac nights
    • lay sleepless all night
    • twenty watchful, weary, tedious nights- Shakespeare
  2. engaged in or accustomed to close observation
    • caught by a couple of alert cops
    • alert enough to spot the opportunity when it came
    • constantly alert and vigilant, like a sentinel on duty

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watchful
The watchful guard observed the museum entrance from his post.