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Daylight Signaling

Meaning

Daylight Signaling is the physiological process by which environmental light, particularly the blue-rich spectrum of natural daylight, transmits critical timing information to the body’s central circadian pacemaker. This photic input is the most powerful external cue, or zeitgeber, used to synchronize the body’s internal biological clock to the external 24-hour day. Effective daylight signaling is essential for regulating the timing of numerous biological functions, including hormone secretion and metabolic activity. Insufficient or improperly timed light exposure can lead to circadian disruption and hormonal imbalance.