Vigilance keeps attention scanning the environment for signs that safety may fail. In poetry, it may appear as a sleeper listening for the stair, a child reading a parent's footsteps, or a body that never fully relaxes beneath an open sky. The state can protect, especially after trauma, but prolonged vigilance exhausts perception and turns ordinary ambiguity into warning. Its imagery often combines sharp observation with the inability to rest.

Vigilance is sustained watchfulness for danger, change, or threat. It can protect a person, but constant vigilance may become exhausting hypervigilance. Poetic language often conveys it through sharp sounds, guarded speakers, sleeplessness, and images of doors, shadows, or listening.