Researchers at St George's University of London in the UK analysed the body measurements, blood sample results and questionnaire data from 4,525 children of multi-ethnic descent, aged 9 to 10 years, in the UK.
They found that children who slept longer had lower body weight and lower levels of fat mass. Sleep duration was also inversely related to insulin, insulin resistance and blood glucose.
The National Health Service (NHS) in the UK recommends a sleep duration of 10 hours for a 10 year old.
"Potential benefits associated with increased sleep in childhood may have implications for health in adulthood," he said.
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Increasing the mean weekday sleep duration (10.5 hours) by half an hour could be associated with a 0.1 kilogramme per square metre lower body mass index (BMI) and a 0.5 per cent reduction in insulin resistance, researchers said.
Reducing these levels may have longer-term implications for reduced type 2 diabetes in later life, they added.