Abstract Introduction Adolescents who experience insufficient, poor quality sleep, and sleep problems might experience difficulties with externalizing behaviors including aggression and impulse control (Bauducco et al., 2019; Brown et al., 2022). Surprisingly, sleep and behavior for youth residing in long and short-term juvenile justice facilities is understudied. The present preliminary analysis explores self-reported sleep problems and aggressive and impulse control symptoms for youth under the care of the Department of Juvenile Services (DJS). Methods Participants (N=62, 86% male, mean age = 16.8, SD=1.2) were recruited from 11 DJS detention and treatment facilities in Maryland. Racial Backgrounds: 55% Black, 18% White, 14% Multiracial, and 12% Other. They completed an online questionnaire focused on sleep behaviors (daytime sleepiness, sleep-wake behavior problems) and daytime functioning including aggressive and impulse control behaviors (e.g., modified Aggression Questionnaire, Buss & Perry, 1992; Weinberger Adjustment Inventory, WAI, 1990). Using Pearson correlations, associations between sleep problems, daytime sleepiness and externalizing behaviors were examined. Results Self-reported daytime sleepiness and sleep-wake behavior problems were associated with increased aggressive and impulse control difficulties. Youth with more sleep-wake behavior problems reported higher levels of aggressive behaviors (r = .39, p < .01) and impulse control behaviors as measured by the WAI (r = .33, p < .05). Similarly, youth with high levels of daytime sleepiness also reported more impulse control behaviors (r = .40, p < .01). Conclusion Preliminary findings suggest that youth residing in juvenile justice facilities with sleep difficulties are more likely to report aggressive and impulse control challenges. Further analyses will provide a greater understanding of the modifying factors to better understand the youth’s sleep-living environment. Support (if any) This research is made possible by the American Academy of Sleep Medicine (AASM) Foundation Award #22-CS-19 and Maryland Department of Juvenile Services’ supportive collaboration.