Article: The secrets of sleep.(many intriguing studies in both humans and animals suggest that the sleeping brain does something to solidify memories and process newly learned lessons)

Health education teacher Pacy Erck remembers what it was like back when Edina High School students had to show up by 7:25 a.m. "The kids were always very tired," she recalls. But these days, Erck rarely has a kid nod off in class. That's because in the fall of 1996, officials at this Minnesota school decided to ring the first bell an hour later, at 8:30 a.m. Sleep researchers had reported that teens' natural slumber patterns favor a later bedtime, and the school wanted to ensure that its high schoolers weren't being shortchanged by an early wake-up call. The change means that students average five more hours of sleep a week, and teachers can see a difference. "You don't ...

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