One of the tests coming up in the International Space Station is the use of various wavelengths of light to stimulate wakefulness and sleep: NASA To Test Space-Sleep Colour-Changing Lights Blue light causes alertness.
URL: http://www.topix.com/health/depression/2012/12/blue-light-to-stay-awake-red-light-to-sleep?fromrss=1
Enclosure: http://www.topix.com/bigpic/mini-b46cd29128fa931d18c0132dc206f895
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