Teens are often notorious for staying up late. Young individuals sacrifice their sleep time over school assignments, early-morning classes, part-time jobs, and social activities, not to mention losing sleep over the use computers and other electronic gadgets. 　　However, according to a recent study, lack of sufficient sleep, which is less than eight hours, can affect teens' academic performances, as well as increase their risky behaviors. Teen respondents in the study who have less than eight hours of sleep were found associated with 10 out of 11 health risk behaviors, including smoking, drinking alcohol, being sexually active, using drugs, and feeling sad or helpless. 　　To avoid negative behaviors in teens, researchers suggest that parents should try to set consistent bed times for their teenage kids, and encourage them to have sufficient sleep.