Sleep increases kids' attention span.
Children who consistently sleep fewer than ten hours a night before age 3 are three times more likely to have hyperactivity .
Sleep promotes growth.
You've probably had mornings where you've sworn your baby got bigger overnight, and you'd be right. "Growth hormone is primarily secreted during deep sleep," says Judith Owen.
Sleep promotes learning.
Sleep aids learning in kids of all ages, and education experts are finding that naps have a particular magic. Neuroscientists at the University of Massachusetts Amherst taught a group of 40 preschoolers a game similar to Memory. Then the kids took a nap (averaging 77 minutes) one week and stayed awake the other week. When they stayed awake they forgot 15 percent of what they'd learned, but when they napped they retained everything. The kids scored better on the game not only after they'd just woken up but the next day too.
Sleep reduces injury risk.
Kids are clumsier and more impulsive when they don't get enough sleep, setting them up for accidents. One study of Chinese children found those who were short sleepers (i.e., fewer than nine hours per night for school-age children) were far more likely to have injuries that demanded medical attention. And 91 percent of kids who had two or more injuries in a 12-month period got fewer than nine hours of sleep per night.