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Humanity is Light-Starved

For thousands of years, humans lived primarily outdoors, waking with the sun, working under the sky, and resting as daylight faded. They weren’t wearing sunglasses, they weren’t trapped behind glass windows, and they weren’t bombarded by artificial blue light at night.

Fast forward to today: Over 90% of people spend most of their time indoors—working, eating, and even exercising under artificial lighting, completely disconnected from the natural light signals our bodi...