![]() Surprisingly perhaps, our brains still work with these light and color cues, with cool blue “daytime” frequencies causing our brains to spin up and be ready for the day, while the absence of blue, the shift to a warmer color palette, slows down our brains, caused the production of a hormone called melatonin, and lets us comfortably drift off to sleep. But it’s not just overall illumination, it’s actually the frequencies of light that change, with the bright blues of the daytime sky versus the warmer yellows and oranges of the communal fire. ![]() Time to hunt! As the light dims and it becomes night, your brain gets the opposite signal: Time to sleep. When it becomes bright outside your brain kicks into gear and wakes up your body. Imagine you live in a cave and your body cycles are completely regulated by the seasons.
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