A289 SLEEP, Volume 44, Abstract Supplement, 2021 B. Clinical Sleep Science and Practice IX. Sleep and Psychiatric Disorders Conclusion: In this study, individuals with sleep disorders had an in- creased suicide rate when compared to those with no sleep disorders. Higher suicide rates were found for individuals sufering from narco- lepsy, insomnia and sleep apnea. More attention towards risks of sui- cide among people with sleep disorders might be needed. Support (if any): 740 INSOMNIA, COGNITIVE AROUSAL, AND PERINATAL- FOCUSED RUMINATION FUEL PERINATAL DEPRESSION Andrea Cuamatzi Castelan, 1 David Kalmbach, 1 Philip Cheng, 1 Christopher Drake, PhD 1 1 Henry Ford Hospital Introduction: Depression is among the most prevalent perinatal complications, yet modifable risk factors remain elusive. Over half of perinatal women endorse clinical insomnia symptoms, which are etiologically implicated in depression in non-perinatal samples. Yet, prospective data on perinatal insomnia and depression are mixed. We sought to clarify temporal associations of insomnia and depression during peripartum, and to investigate cognitive arousal as a potential mechanism facilitating this relationship. Methods: Seventy pregnant women completed sociodemographic information and baseline sleep and mood symptoms between gesta- tional weeks 25–30. Beginning at gestational week 30, participants completed 17 weekly online surveys assessing insomnia, depres- sion, and three cognitive arousal indices (nocturnal cognitive arousal, perseverative thinking, perinatal-focused rumination). Mixed efects models were conducted to test hypotheses. Results: Women were at elevated risk of screening positive for depres- sion when experiencing high levels of insomnia (OR=2.36, 95%CI=1.28, 4.35), nocturnal cognitive arousal (OR=3.05, 95%CI=1.60, 5.79), perinatal-focused rumination (OR=2.05, 95%CI=1.11, 3.79), and perseverative thinking (OR=7.48, 95%CI=3.90, 14.32). Prospective analyses revealed bidirectional efects between insomnia and cogni- tive arousal, and both predicted future depression. Nocturnal cogni- tive arousal mediated 23–43% of the efect of insomnia on depression. Insomnia mediated 12–18% of the efect of nocturnal cognitive arousal on depression. A similar pattern was observed with perinatal-focused rumination. Depression did not predict insomnia. Conclusion: Perseverating at night, particularly on perinatal con- cerns, fuels insomnia. In turn, lying awake at night provides ample opportunity for perseverating. This cycle feeds perinatal depression. Daytime cognitive arousal may indirectly disrupt sleep as persever- ating during the day persists into the night. Support (if any): 741 SLEEP AND POSTPARTUM DEPRESSION IN HEALTHY FATHERS: PERCEPTIONS OF SLEEP QUALITY PREDICT SEVERITY OF SYMPTOMS Christopher Kalogeropoulos, 1 Rebecca Burdayron, 2 Christine Laganière, 1 Marie-Julie Beliveau, 3 Karine Dubois- Comtois, 4 Marie-Helene Pennestri 2 1 McGill University, 2 Department of Educational & Counselling Psychology, McGill University, 3 Université de Montréal, 4 Université du Québec à Trois-Rivières Introduction: Research on the link between sleep quality and de- pression in the postpartum period has focused primarily on mothers. Although fathers also experience poorer postpartum sleep and are at risk of developing depressive symptoms, they remain understudied. To date, the limited research focusing on paternal sleep and depression has relied on subjective measures of sleep, without objective verifca- tion. The current study implemented a multi-measure approach using subjective and objective indices to explore the relationship between sleep and depressive symptoms in fathers at 6 months postpartum. Methods: Fifty-four healthy fathers participated in this cross-sectional study. Paternal sleep was assessed for 2 weeks utilizing: 1) a self-report daily sleep diary, 2) a self-report perceived sleep quality rating, and 3) actigraphy. Subjective indices via the sleep diary measured par- ticipants’ perception of their total nocturnal sleep duration and total number of awakenings (self-reported sleep duration and fragmenta- tion). Perceived sleep quality ratings measured participants’ percep- tions of how well they thought they slept. Objective sleep variables measured through actigraphy included: total nocturnal sleep duration, number of awakenings, sleep efciency, and wake after sleep onset (WASO). Paternal depressive symptoms were assessed with the Center for Epidemiologic Studies – Depression Scale (CES-D). Results: Regression analyses showed that subjective sleep variables (measured by the sleep diary) and objective sleep variables (meas- ured by actigraphy) did not signifcantly predict postpartum depres- sive symptoms in fathers (p > .05). However, self-reported perceived sleep quality signifcantly predicted postpartum depressive symptom severity in fathers (R2 = .172, p = .034). Conclusion: These fndings advance our understanding of the link between sleep and depression in fathers. The results highlight the im- portant role of fathers’ perceptions of sleep quality, rather than the ac- tual quality or quantity of their sleep (measured through the sleep diary or actigraphy), in the development of postpartum depressive symp- toms. The multi-measure approach to sleep implemented in this study expanded our knowledge about how diferent facets of sleep relate to depression. These fndings have important implications for the devel- opment of clinical interventions targeting paternal sleep and mood in the months following childbirth. Support (if any): Social-Science and Humanities Research Council (SSHRC) and Fonds de recherche du Québec – Santé (FRQS) 742 LINKAGES BETWEEN SLEEP QUALITY AND MENTAL HEALTH AMONG COUPLES COPING WITH TYPE 1 DIABETES ACROSS SURVEY AND DAILY DIARY METHODS Eunjin Tracy, 1 CYNTHIA BERG, 2 Jonathan Butner, 2 Robert Kent de Grey, 2 Nancy Allen, 3 Margot Porter, 4 Vicki Helgeson 5 1 University of Pittsburgh, 2 University of Utah, 3 University of Utah College of Nursing, 4 University of Utah School of Medicine, 5 Carnegie Mellon University Introduction: Sleep serves an important role in maintaining and promoting metabolic and mental health. The interdependent nature of couple relationships makes examining sleep quality from a dyadic perspective critical. This study examined the efect of sleep quality on mental health among couples coping with type 1 diabetes across survey and daily diary methods and investigated whether relationship satisfaction moderated these relations. Methods: 199 persons with type 1 diabetes (Mage = 46.82) and their spouses (Mage = 46.41) completed one survey questionnaire reporting their own sleep quality (PSQI), depressive symptoms (CESD), and re- lationship satisfaction (CSI). They also completed 14-day diaries re- porting on their own sleep quality and negative afect. The actor-partner interdependence model and multi-level model were used to examine the efect of sleep quality on mental health across the cross-sectional and daily diary surveys. Multi-level modeling examined efects of within-person and between-person efects of sleep quality on next-day daily negative afect (controlling for prior day afect). 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