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In addition to the reasons others have provided, I prefer to read in bed on one of my Kindles v. my phone or PC because it doesn't involve exposure to a bright screen. Exposure to bright light during the "night" part of our circadian rhythms is associated with poor health, e.g. higher rates of breast cancer. Plus it's hard enough to regulate my circadian rhythm in the winter at 61.5 degrees N without shutting down melatonin production right before I'm supposed to sleep for eight hours.
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