I just got these blue blocking "biorhythm" glasses off amazon.
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Tested to block 100% of light from 280 - 490nm (this includes UV). Blocks 99.82% of light in the critical 450 - 510nm range. This is the most disruptive wavelength of light at night. It is also the same frequency of light that is blasted directly into your eyeballs from electronic devices!
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These aren't as dark as my other pair and they work great. I was reading on the Oasis last night and the screen was nice and orange. This simple solution really works for me. Highly recommended even if you look a little dorky before bed. There are even more expensive stylish $70 ones that are a different brand.