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A comment on How being alone may be the key to rest. Parent comment
Short wavelength blue light from smart phones/computers affect circadian rhythms:
http://www.scientificamerican.com/article/q-a-why-is-blue-li...
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Short wavelength blue light from smart phones/computers affect circadian rhythms:
http://www.scientificamerican.com/article/q-a-why-is-blue-li...