Only 1 in 20 U.S. adolescents is meeting national recommendations for sleeping, physical activity, and screen time, according to new research with nearly 60,000 American high school students. Just 3 percent of girls reached all three guideline targets, compared to 7 percent of boys.

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Only 1 in 20 U.S. adolescents is meeting national recommendations for sleeping, physical activity, and screen time, according to new research with nearly 60,000 American high school students. Just 3 percent of girls reached all three guideline targets, compared to 7 percent of boys.