Tablets and televisions, laptops and smartphones: They all emit a blue light—and that's what's worrying scientists. While this light boosts mood and alertness during the day, at night it can disrupt your natural sleep-wake cycle. They recommend avoiding screens beginning two to three hours before hitting the pillow. For many, that might be a hard to pill to swallow, so at the very least, keep light-emitting electronics out of the bedroom.
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