Evaluate the integral 
Definitions:
Light
Electromagnetic radiation within a certain portion of the electromagnetic spectrum, which can be perceived by the human eye.
Zeitgeber
External or environmental cue that synchronizes an organism's internal body clock to the 24-hour day and night cycle, such as light.
Circadian Rhythm
The roughly 24-hour cycle in the physiological processes of living beings, influencing sleep-wake patterns, hormone release, and other bodily functions.
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