Free app adjusts color on monitors to prevent disruption of sleep cycle


Humans evolved to respond to darkness by producing melatonin, the hormone that regulates the sleep cycle. But our light-sensitive pineal gland near the center of the brain responds to blue light by suppressing melatonin, causing us to wake up, the Washington Post reports. When we see too much blue light in the late evening, it delays or disrupts the melatonin rush. In other words, my iPad can keep me up
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