0982 Quadratic Association Between Ecologically Assessed Sleep Duration and Next-day Suicidal Ideation in Youth

Abstract Introduction Sleeping too little or too much has been linked to adverse mental health outcomes in youth. Most studies that described the link between sleep duration and suicide risk in youth, however, relied on a single assessment of sleep and suicidal ideation, with considerable temporal gaps in between. Characterizing the proximal link between sleep duration and suicide risk in children and adolescents is essential for developing informative, early mobile interventions. We examined the association between ecologically assessed suicidal ideation (SI) and sleep duration in youth recruited after a partial hospitalization program. We also examined contextual factors in relation to sleep duration that are particularly salient for youth, including nighttime social media use and social media use-related self-referential cognitions. Methods We used ecological momentary assessment (EMA) 3 times/day over two weeks in discharged partial hospital patients to assess their levels of SI at home (n=79; 62% assigned F at birth; ages 12-15; mean 13.52; sd 1.14 yr). We also asked youth to report their bedtimes and waketimes every morning for two weeks. Social media use was assessed once via a questionnaire. Results Using generalized linear mixed models, we showed a significant quadratic effect of sleep duration on next-day SI (B=–0.04, SE =0.01, p 0.001). The turning point of the quadratic function was the sleep duration of 10 hours. Specifically, longer sleep was linked to lower next-day SI, with this association reversing at 10 hours of sleep. Nighttime social media use (B=–0.18, SE =0.05, p 0.001) and engaging in social media use-related self-criticism (B=–0.10, SE =0.05, p 0.05) were both linked to shorter sleep duration, whereas daytime social media use was not associated with sleep duration (p0.05). Conclusion These preliminary findings point to a curvilinear association between how long children and adolescents sleep and how much they think about suicide the following day and highlight the significance of social media use at bedtime. The findings emphasize the potential clinical relevance of daily assessment of sleep duration in developing adaptive, just-in-time interventions to decrease suicide risk in youth. Support (if any) NIMH Career Development (K23MH122587) Award; Bradley Hospital COBRE Center (P20GM139743).