Knell G, et al. - Given that sleep, physical activity, and screen-time behaviors among adolescents are risk factors for physical health, mental and emotional health, behavioral outcomes, and performance-based outcomes, researchers analyzed the prevalence and likelihood of US adolescents meeting these recommendations in combination across various sociodemographic factors. It is therefore recommended that children (age 6-12 years) sleep from 9 to 12 hours and adolescents (age 14-18 years) sleep from 8 to 10 hours per night and that both groups accumulate at least 1 hour of aerobic physical activity with moderate intensity or vigorous intensity and limit the screening time to less than 2 hours within 24 hours. Meeting recommendations for all three behaviors may be more related to health outcomes than meeting any one recommendation in isolation.