The Wakefulness Signal: How Your Eyes Control Your Hormones
You are likely familiar with the sensation of being "tired but wired." It is 11:30 PM. Your body is physically exhausted—muscles fatigued, eyelids heavy—yet your mind is racing. You lie in the dark, but your brain refuses to initiate the shutdown sequence. This is not a psychological failure. It is a physiological input error. For 99.9% of human history, light was synonymous with heat and activity. The sun rose, and with it, the spectrum of light shifted from the warm reds of dawn to the bright blue-enriched white of midday....
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