RONI CARYN RABIN

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Your brooding teen: Just moody or mentally ill?

John Hill was a typical teenager in many ways: He started smoking when he was in high school, which upset his mother, and he spent a lot of time in his room alone, staying up until 5 in the morning playing video games. He went to school but often signed himself out sick after a couple of hours, and his grades plummeted.

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Hyper kid? Sleep apnea may be the culprit

When Benjamin Kidd was in pre-K last year, his teachers marveled at how bright, attentive and well-behaved he was — in the morning.

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