When daylight, which is a blue light, hits the back of your eyes in the morning, your brain stops producing melatonin. You feel awake and ready to start your day. When blue light fades (and is replaced by darkness or the yellow glow of incandescent bulbs), melatonin begins to be released again. 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
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