Circadian math: 1 plus 1 doesn't always equal 2

Like a wristwatch that needs to be wound daily for accurate time-telling, the human circadian system — the biological cycles that repeat approximately every 24 hours — requires daily light exposure to the eye's retina to remain synchronized with the solar day. In a new study published in the June issue of Neuroscience Letters, researchers have demonstrated that when it comes to the circadian system, not all light exposure is created equal.

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<p><a href="http://www.physorg.com/news132055021.html">Circadian math: 1 plus 1 doesn't always equal 2</a></p> <p>Like a wristwatch that needs to be wound daily for accurate time-telling, the human circadian system — the biological cycles that repeat approximately every 24 hours — requires daily light exposure to the eye's retina to remain synchronized with the solar day. In a new study published in the June issue of <i>Neuroscience Letters</i>, researchers have demonstrated that when it comes to the circadian system, not all light exposure is created equal.</p>