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There was a study that came out a few months ago, can't remember exactly who did it, although I keep meaning to ask one of the professors at work that studies sleep stuff about it and what her opinions of the research were. But it did find some effects of staring at lcd screens before going to bed.
I spend basically all day staring at computer screens, and a good chunk of the evening too. I'm definitely not the best sleeper, and find it will take me quite some time to get to sleep frequently. Now, when I'm on vacation, and I literally do everything I can to avoid looking at a computer, I suddenly find I can get to sleep much earlier in the evening. Obviously there's a lot of factors involved there, but I do kinda wonder if there's some relationship. Wouldn't completely surprise me.
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