While We Sleep, Our Mind Goes on an Amazing Journey Our floodlit society has made sleep deprivation a lifestyle. But we know more than ever about how we rest—and how it keeps us healthy :By Michael Finkel

https://www.nationalgeographic.com/magazine/2018/08/science-of-sleep/?cmpid=org=ngp::mc=social::src=facebook::cmp=editorial::add=fb20180717ngm-scienceofsleep::rid=&sf193849909=1