Light Pollution Is A Public Health Issue--It's Not Just Making You Tired, It's Making You Sick

After dark, electric lights disrupt our natural circadian rhythms—and the consequences could be far worse than just a little lost sleep.

For thousands of years, man lived in synchronicity with day and night patterns, his wakefulness and sleep tracking light and dark. Then he invented artificial light and suddenly our rhythms were out of sync. We extended the day, and got a lot more done—but with impacts to our physiology that we're still only beginning to understand.

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