US researchers from SRI International, an independent research institute in California, found that children in households with bedtime rules performed better in language activities, reading and maths compared with those who went to bed at different times.
They also found that children who had earlier bedtimes and slept for a minimum of 11 hours a night had improved cognitive development.
Researchers analysed the data of 8,000 children aged four from the Childhood Longitudinal Study Birth Cohort. Data included information from interviews with parents about the times their child usually went to bed and got up at nine months old and again at four years old.
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