Only about 1 in 20 American teenagers get enough sleep and exercise, according to a study published by the CDC.
The study looked into the habits of about 60,000 teens.
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The conclusion: about 5-percent of teens get the recommended amount of sleep and exercise, and don't spend too much time in front of a screen.
The CDC recommends at least eight hours of sleep per day and an hour of vigorous physical exercise.
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One expert says parents need to set an example for their teens by turning off their electronic devices before bedtime.