Blue light keeps night owls going

By Ben Harder, 15:52 PM April 15, 2008

A study of nine young men suggests that blue light beats back sleepiness and dampens key physiological changes that normally occur in the late evening. Green-yellow light doesn't have the same effect. Blue light, or white light containing it, therefore, might help evening workers stay alert, the researchers say.

Certain light receptors in the eye affect how the body calibrates its internal clock and orchestrates daily oscillations in body temperature and heart rate. To better understand the r...

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