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This is Scientific American's 60-Second Science. I'm Allie Wilkinson. Got a minute?

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Our homes glow at night.

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Lightbulbs, TVs, and now computers, e-readers, tablets and smartphones expose people to an increasing amount of light after dark.

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And the color of that light may influence mood and brain function.

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That's according to a study in the Journal of Neuroscience.

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Researchers looked at the role of specialized photosensitive cells in the retina.

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The cells, called ipRGCs, are responsible for regulating circadian rhythms.

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And recent evidence suggests these cells may also play a role in mood and cognition.

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To test how nocturnal lighting color affects mood, the researchers exposed hamsters to nighttime conditions of no light, red light, white light or blue light for four weeks each.

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Hamsters exposed to red light at night had the fewest brain changes associated with depression in humans,

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while blue and white light had the worst effects on mood.

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So late-night work e-mail may not be the only thing ticking you off,

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the blue glow of your machine may also be getting you down.

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The best bet: shut down and get some shut-eye.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Allie Wilkinson.

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