(CNN)Ask parents of teenagers what they're worried about, and among the issues they're likely to bring up is their teens not getting enough sleep. So many teens stay up past midnight and get up early, especially when their school starts, in some cases, well before 8:00 a.m.
Teens who see others drink or use drugs are more likely to engage in antisocial behavior on that same day, a new study suggests. The risk is greatest for young teens who have a “risk-taking” gene linked with sensitivity to substance use exposure.
