I read before bed but am unsure if I should be using a no back light Kindle or if the Kindle app on my iPhone is ok? Anyone have experience with sleeping quality after reading using either of these?
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Since your Kindle doesn’t have a backlight (and especially the warm light), any difference really depends on the other lighting you are using. A dim, warm house lamp is probably better for sleep hygiene than the phone even with it changing its color temperature. If you have no problem falling asleep with either one then I don’t think it matters much.