Every evening as the sun sets, Robb Wolf begins his nightly ritual: While his two daughters play, he slowly dims the lights, just a few lumens every 20 to 30 minutes, until the house, in Reno, Nevada, is dark. The family is asleep before 8 p.m. and awake before dawn, as Wolf imagines our ancestors were millennia ago, before artificial light interrupted our “normal circadian rhythms.”
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