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Sleeping time ‘8 hours vs 10 hours’… 6-year-old child’s IQ difference

A study found that children who slept less than those who slept for 10 to 13 hours had lower IQ (intelligence quotient).

On the 30th, a team led by Professor Yun-cheol Hong of Seoul National University’s Environmental Health Center announced the results of a study on the relationship between children’s sleep time and IQ scores.

The research team analyzed the association between sleep duration and children’s IQ scores in 538 children aged 6 years. As a result, as the sleep time increased, the verbal IQ score tended to increase. In the case of boys, if they slept less than 8 hours, their IQ scores were 10 points lower than those who slept more than 10 hours. However, the girls did not show this tendency.

Researchers including Lee Kyung-shin, secretary general of Seoul National University’s Environmental Health Center and Kim In-hyang, a professor of psychiatry at Hanyang University Hospital, said, “The National Sleep Foundation recommends sleeping for 10 to 13 hours in the first half of the school year before going to school and 9 to 11 hours for young students. However, in the case of Korea, 86.1% of children aged 7-8 years sleep less than 9 hours, which is a serious lack of sleep.”

The research team has been operating an environmental health center designated by the Ministry of Environment since 2008, and to check the relationship between environmental exposure and children’s physical and neurocognitive development, 726 pregnant women from Seoul, Gyeonggi, and Incheon were recruited and cohort (group) at 2-year intervals. is operating The study, which revealed the link between sleep and intelligence, was also conducted in that cohort.

Hong Yun-cheol, head of the center, said, “The results of this study show that the sleep time for children not only affects physical development, but also plays an important role in cognitive development and immune system development. There have been many reports of research results related to the relationship between quality and cognitive development. In this study, in particular, there was a difference in the relationship between sexes, so additional research is needed.”

Director Lee Kyung-shin said, “Since this study was conducted based on the total amount of sleep time, additional research is needed on the best time to sleep and the quality of sleep. In particular, it is saying that you need enough sleep, but it does not mean that the more time you sleep, the better.”

The paper containing this study was published in the latest issue of the International Journal of Behavioral Medicine

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