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I have a feeling that most of this blue-light filter stuff is hype. We live in a fast paced world and a lot of people have problems sleeping and maybe blue light really does affect that but nobody knows for sure. Anyway most of the research on that has involved tablets, not ereaders. Tablets and ereaders have very different lighting situations and on an ereader you're much less affected because there's much less light.
My guess is that a blue light filter on an ereader means nothing. I have no evidence whatever for that but neither does anyone on either side of this discussion.
For what it's worth I read my Kindle in bed almost every night until I'm sleepy and then I go to sleep. I sleep pretty well most of the time. Of course a sample of one means very little but it's the only evidence there is.
Barry
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