"If kids are getting adequate sleep, they're going to have more energy during the day to be physically active, " says Dalton, who has researched the link between families and obesity but was not involved in the current study.

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We know that people should eat healthier and be more physically active.

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It aims to provide an environment that makes it easier and safer for children, young people and adults to choose to be more physically active and increase participation in sport.

BBC: Debate on the physical activity action plan