Amazon is pushing out a software update to its Fire tablets, and among the features it brings is one becoming increasingly common — a nighttime-friendly mode that reduces blue light output to increase one’s odds of falling asleep. The idea is that blue light makes it harder to fall asleep, and thus the nighttime use of tablets and phones disrupts one’s sleep quality…unless they have this kind of display mode.
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https://www.slashgear.com/amazon-fire-tablets-get-night-friendly-display-mode-02416748/