A survey of more than 5, American teens found that three out of four owned an iPhone. What happened in to cause such dramatic shifts in behavior? A meta-analysis of studies on electronic-device use among children found similar results: Children who use a media device right before bed are more likely to sleep less than they should, more likely to sleep poorly, and more than twice as likely to be sleepy during the day. In just the four years from to , 22 percent more teens failed to get seven hours of sleep. The time that seniors spend on activities such as student clubs and sports and exercise has changed little in recent years. T he correlations between depression and smartphone use are strong enough to suggest that more parents should be telling their kids to put down their phone. But it was exactly the moment when the proportion of Americans who owned a smartphone surpassed 50 percent. The drop is the sharpest for ninth-graders, among whom the number of sexually active teens has been cut by almost 40 percent since
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