vigilance
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Keep your eyes peeled
To look very carefully and be on the alert for something specific or anything unusual.
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Have eyes in the back of one's head
To possess an exceptional level of awareness, seemingly able to perceive everything happening around oneself, even things out of direct sight.
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Sleep with one eye open
To remain extremely vigilant and cautious, even while resting, due to a sense of danger or unease.
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Have eyes in the back of your head
To be exceptionally observant and aware of everything happening around you, even things out of your direct line of sight.