Abstract
This study investigates how sleep regularity moderates the association between ethnic/racial discrimination and academic grades among diverse adolescents. The study included a 14-day, daily diary and actigraphy study of ninth-grade adolescents in the United States (N = 265; mean [SD] age 15.26 [0.62] years, 41.51% Asian, 21.13% Black, 37.35% Latinx, 71.32% female) who completed measures of demographic information and ethnic/racial discrimination (Daily Life Experiences Racism and Bother subscale). Sleep data were collected for 14 consecutive days with wrist actigraphy, and sleep regularity was calculated using the Sleep Regularity Index (SRI). Academic grades were provided by the Department of Education. Discrimination frequency was associated with lower academic grades, and the SRI moderated this association. Compared to adolescents who had moderate and regular SRI profiles, adolescents with irregular SRI (i.e., lower sleep regularity) had stronger negative associations between discrimination and grades. On the other hand, for adolescents who had moderate to high sleep regularity, there was no significant association between discrimination and grades. This study underscores the importance of sleep regularity for adolescents' academic achievement.