Every sunrise and sunset sends the body a signal, keeping the circadian clock running on a roughly 24-hour cycle. This clock evolved so organisms could adapt to Earth’s daily rotation, syncing their biology to the pattern of day and night. Artificial lighting has freed human societies from relying on the sun to go about daily life, extending activity well into the night, but this convenience comes with a trade-off.
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Exposure to bright evening light linked to higher risk of age-related eye disease
June 24, 2026
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