Parents have never lacked for reasons to lie awake at night. They worry endlessly about keeping their kids healthy and safe and fret about such persistent problems as teen drug use, dropout rates, pregnancy and crime. How, they wonder, will their under-18s ever become tomorrow's thirtysomethings?
Perhaps they ought to start sleeping better. According to a sweeping U.S. government study conducted by 20 federal departments and agencies and released last week, the kids are actually doing just fine. By almost any important measure, the report was bursting with good news: teen birthrates are at record lows; teen crime rates are...