In his new book, Teen Brain, David Gillespie suggests anxiety and other problems are on the rise among teenagers due to smartphones and tablets. This could be true, but his claims are overblown.
Researchers tracked adolescents' sleep and scanned their brains. As expected, better sleep went with healthy brain development. Unexpected was the importance of one aspect of where teens slept.
In recent years, the notion of a structurally imbalanced teenage brain has been faulted for bad choices. A review of studies suggests that a deficit in brain development is not to blame.