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Daytime Vigilance

Meaning

Daytime Vigilance is a measure of sustained, high-quality alertness and cognitive focus maintained throughout the waking hours, reflecting optimal neurophysiological and hormonal regulation. It signifies a state of consistent mental acuity, efficient information processing, and minimal subjective feelings of drowsiness or fatigue during the day. This optimal state is not merely the absence of sleepiness but the active engagement of neural networks responsible for attention and executive function. Clinically, robust daytime vigilance is a marker of a well-regulated circadian rhythm and effective neurohormonal balance, particularly involving cortisol and orexin signaling.