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White is red, green and blue mixed in equal measures, so yes the light contains blue. As JSWolf said the "research" is bogus. I once asked a biologist about light and sleep disruption, and she said it was light in general at night that can disrupt sleep. The weak light from a kindle or a tablet will hardly matter compared to say having all of your lights on at home or working late in an office with bright overhead fluorescent fixtures.
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