Soon you'll be able to fall asleep with Amazon's Fire tablets and still get a restful night's sleep. Starting today, Amazon is rolling out a new "Blue Shade" feature that turns down blue light on its tablets' screens, making them more comfortable to read at night. And honestly, it's about time. Scientists have been saying for some time that the blue light emitted by our devices' screens wreaks havoc on our sleep habits (some are calling for similar night modes for phones). It's for that same reason that I can't even use a computer these days without installing something like Flux, which warms up screen colors at night. Amazon says you'll be able to tweak Blue Shade's color settings as you see fit, and it also lets you read at an "ultra-low" brightness level.