The positive association between sleep and performance is strongest among lower-achieving students¶

Claim · All claims
Evidence · 1 study · associational r2 · q2
Currency · newest study 2025 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Quantile regression shows the positive sleep effect is most pronounced at the 20th–50th percentiles in mathematics and English, and in the 10th–20th percentiles for science and arts. → Wang 2025

Evidence¶

Wang 2025¶

Wang, M., Chen, Z., Han, N., & Yao, H. (2025). Sleep duration and subject-specific academic performance among adolescents in China. npj Science of Learning. https://doi.org/10.1038/s41539-025-00361-y

q2 · i? · associational · r2

Quantile regression across the achievement distribution (Fig. 3), showing the marginal effect of sleep decreases as performance levels rise. The article attributes this to a possible marginal compensation mechanism of basic cognitive resources.

"in mathematics and foreign language, the positive effect of sleep duration is most pronounced among students in the 20th to 50th percentiles, suggesting that students with average or below-average performance are more likely to benefit from adequate sleep"

Discussion¶

Learner Variables¶

• Sleep — predictor: learners who differ on it differ in outcomes

Related Claims¶

• Sleep duration contributes more to variance in Chinese, mathematics, and science performance than to English and arts, but less than socioeconomic status in every subject — related
• Grade 8 reading scores in 2019 decreased across the performance distribution, with greater decreases at the 10th and 25th percentiles — related
• Optimal sleep duration varies by subject: about 8–9 hours for mathematics and 7–8 hours for Chinese, English, science, and arts — related
• Quantile regression estimates show little evidence of heterogeneous Mathematics Mastery treatment effects across the post-test score distribution — related