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I've been reading half an hour to an hour in bed before I go to sleep. I read mostly on my phone and don't worry about the color of the light. I sleep just fine.
As I recall this all began when studies showed that bright blue light can alter our sleep patterns. The studies involved more light than we get from our phones and a lot more than we get from our Kindles. And from there it took off and became a thing.
Once the public began to believe it companies trying to sell us stuff jumped on the bandwagon. Now it's a "known fact", to quote my neighbor when she describes anything that she has no evidence for but has been told by someone she trusts in her church.
I have a Nook Glowlight 3 and I did add just a bit of yellow to the light and I like it better than I did before I added that. Not enough to really matter but why not! So I do benefit a bit from this hysteria.
Barry
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