Sleep

Childhood Sleep Duration and Academic Achievement: Effect Modification of Sociodemographic and Environmental Factors.

Cheon Y, Lorenzo K, et al. • Child: care, health and development • 2026

TL;DR

While there was no direct association between children's sleep duration and academic achievement, the association between sleep duration and high academic achievement significantly varied by household crowding, with sufficient sleep being especially influential for academic achievement in less crowded households.

Key Findings

Results

No direct association was found between sleep duration and academic achievement in sixth to eighth graders.

Sample consisted of 262 sixth to eighth graders from the 2009 New York City Child Community Health Survey
Multinomial logistic regression was used to assess associations between sleep duration and academic performance
The null finding held before testing for effect modification by sociodemographic and environmental variables

Results

The association between sleep duration and high academic achievement was significantly modified by household crowding.

Effect modification by household crowding was statistically significant
Sufficient sleep was especially influential for academic achievement in less crowded households
Sociodemographic and environmental variables were tested as effect modifiers using multinomial logistic regression
Other sociodemographic and environmental variables tested did not produce statistically significant effect modification

Conclusions

The study provides support for the National Sleep Foundation's recommendation of 9–11 hours of sleep for children ages 6–13.

The NSF recommends 9–11 hours of sleep for children ages 6–13
The findings are framed as providing 'further support' for this recommendation
The sample targeted early adolescents in grades 6–8, consistent with the 6–13 age range addressed by the NSF guideline

Methods

Data were drawn from the 2009 New York City Child Community Health Survey, focusing on early adolescents.

Sample size was n = 262
Participants were sixth to eighth graders
The dataset was specific to New York City, which may limit generalizability
The survey was conducted in 2009

What This Means

This research suggests that among middle school students in New York City, getting the recommended amount of sleep (9–11 hours per night) does not uniformly predict better grades on its own. However, the home environment matters: the relationship between sleep and high academic achievement was significantly different depending on how crowded a child's household was. Specifically, adequate sleep appeared to be most strongly linked to better academic performance in less crowded living situations. This research suggests that the benefits of sufficient sleep for school performance may not be equally experienced by all children. Children living in more crowded homes may face additional challenges — such as noise, disrupted sleep environments, or stress — that could diminish the academic benefits of getting enough sleep, even when sleep duration itself is adequate. The findings highlight that sleep recommendations like the National Sleep Foundation's 9–11 hour guideline for children ages 6–13 remain important, but that home and social conditions can shape how much those recommendations translate into academic outcomes. This points to the potential value of addressing household and environmental factors alongside sleep health when trying to support children's academic success.

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Citation

Cheon Y, Lorenzo K, Deng W, Seligson A, Yip T. (2026). Childhood Sleep Duration and Academic Achievement: Effect Modification of Sociodemographic and Environmental Factors.. Child: care, health and development. https://doi.org/10.1111/cch.70243

Key Findings

What This Means

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