An enhanced state of sensory sensitivity accompanied by an exaggerated intensity of behaviors whose purpose is to detect threats.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "hypervigilance" in a sentence
"This constant outer preoccupation and hypervigilance is codependency making in that we are overly preoccupied with the moods of another person and under aware of our own moods."
"Psychologically, it was called hypervigilance, a classic symptom of PTSD."
"He examines how terrorism hypervigilance is threatening civil liberties, the economy, and lives."