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https://en.wikipedia.org/wiki/Blue_hour#:~:text=During%20the%20blue%20%22hour%22%2C%20red%20light%20passes%20through,would%20occur%20from%206%3A40%20p.m.%20to%207%20p.m..
https://www.timeanddate.com/astronomy/blue-hour.html
The blue hour refers to the phase of twilight when the Sun is so far below the horizon that the light's blue wavelengths dominate. Because the blue hour is a colloquial term, it doesn't have an official definition similar to dawn, dusk, and …
https://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side
Harvard researchers and their colleagues conducted an experiment comparing the effects of 6.5 hours of exposure to blue light to exposure to …
https://www.sleepfoundation.org/bedroom-environment/blue-light
In fact, the 2011 National Sleep Foundation’s Sleep in America poll 1 found that 90% of Americans report using an electronic device in their bedroom …
https://www.aao.org/eye-health/tips-prevention/should-you-be-worried-about-blue-light
Mar. 10, 2021. When you stare at a screen for hours at a time, whether it is a computer, TV, phone or tablet, you are exposed to blue light from the device. Alarmist headlines claim blue light from too much screen time is blinding us.
https://www.youtube.com/watch?v=U1TbSk2il24
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https://www.webmd.com/eye-health/blue-light-health
It signals your brain to wake up when it should be winding down. In one study, as little as 2 hours of exposure to blue light at night slowed or stopped release of the sleep hormone melatonin ...
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