In a nonstop world, bed might be the ultimate luxury.

HERE’S A DISCONCERTING FACT: The developed world’s severe sleep deficiency is officially a public health epidemic, according to the World Health Organization. You may roll your eyes at the gospel of eight hours of shut-eye as a good, restorative night’s sleep, but if you’re like the majority of the world’s population and regularly clock six or fewer hours a night, your

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