Sleep study reveals how the adolescent brain makes the transition to mature thinking

"We've provided the first long-term, longitudinal description of developmental changes that take place in the brains of youngsters as they sleep," said Irwin Feinberg, professor emeritus of psychiatry and behavioral sciences and director of the UC Davis Sleep Laboratory.

http://www.eurekalert.org/pub_releases/2013-03/uoc--ssr031813.php