Guess what else radiates blue light? Screens. When we use our phones or tablets or computers before bed, their blue light tells our brains that it is daytime and that we should be awake. In other words, when we check our phones at night, we’re giving ourselves jet lag. Screen time, particularly in the hour before bedtime, both keeps us up later and harms the quality of our sleep. But the quality of light is just one way that our phones affect our sleep cycles. Most of the things we do on our phones – reading the news, playing games – are stimulating activities. Imagine how difficult it would
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