Less sleep associated with risky behavior in teens, study says
By Naomi Thomas, CNN
Updated 1801 GMT (0201 HKT) October 1, 2018
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Photos:Where children sleep
A world of poverty and privilege is portrayed in "Where Children Sleep," a photo series by James Mollison, which depicts children's bedrooms around the world. Pictured is 4-year-old Kaya, who lives in a small apartment with her parents in Tokyo.