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The light from backlit screens (computers, TVs, etc.) interferes with the production of the hormone melatonin, which regulates sleep. Devices such as the Kindle don't have backlit screens, but you do need some source of light to read when it's dark. Some people are sensitive to even small amounts of light at night, such as digital clocks.
Reading may be too stimulating for some (I suppose it depends on the book!), but it tends to make me sleepy. I even have this problem during the daytime.
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