A327 SLEEP, Volume 43, Abstract Supplement, 2020 B. Clinical Sleep Science and Practice VI. Adults: Sleep and Aging, Sleep and Gender 0858 IMPACT OF ACTIGRAPHIC SLEEP MEASURES ON AMBULATORY COGNITIVE PERFORMANCE IN A COMMUNITY-BASED SAMPLE OF OLDER ADULTS Buxton, O. M. 1,2,3 Zhaoyang, R. 4,5 Jiao, J. L. 1 Sliwinski, M. J. 4,5 Derby, C. A. 6 1 Department of Biobehavioral Health, College of Health and Human Development, The Pennsylvania State University, University Park, PA, 2 Division of Sleep Medicine, Harvard Medical School, Boston, MA, 3 Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women’s Hospital, Boston, MA, 4 Center for Healthy Aging, Pennsylvania State University, University Park, PA, 5 Department of Human Development and Family Studies, College of Health and Human Development, The Pennsylvania State University, University Park, PA, 6 Departments of Neurology and Epidemiology & Population Health, Albert Einstein College of Medicine, Bronx, NY. Introduction: Few longitudinal studies link objectively assessed sleep and cognition, especially day to day differences in sleep as they relate to daily cognitive performance in ecologically-valid, natural environments. We examine the associations of sleep (actigraphy) with ambulatory ecological momentary assessments (EMA) of cognitive performance. Methods: Analyses involved 225 participants enrolled in The Einstein Aging Study, a community based longitudinal cohort of older adults free of dementia at enrollment (Mage=77.27 years; 33% males; 47% Caucasian, 39% African American, 13% Hispanic). We examined between-person associations between actigraphic sleep duration and wake after sleep onset (WASO) with mean and variability across the day in cognitive performance. Cognitive performance was assessed via validated, smartphone- based EMA over a mean of 18 days. Six assessments/day included Symbol Match (processing speed), Color Dot (working memory), and Color Shape (memory binding). Models controlled for age, gender, ethnicity, education (years), clinically assessed mild cog- nitive impairment, and learning effects. Actigraphy data was col- lected throughout the study period. Results: Sleep duration had a significant effect on within-person variability on ambulatory cognition: Color Dot, Symbol Match, and Color Shape (all p’s <0.001). Older adults with longer mean nightly sleep duration exhibited more stable cognitive performance over time versus those with shorter sleep duration; sleep duration did not predict mean levels of daily cognitive performance. Person- level means of WASO (0.99±0.45 hours/night) predicted mean levels on cognitive tests, independent of sleep duration. Older adults with less WASO/night exhibited better cognitive perform- ance. One half hour less nightly WASO predicted 175ms shorter Symbol Match response time (p=0.004), 1.5% lower Color Dot error proportion (p=0.048), 0.07 points higher Color Shape ac- curacy (p<0.001). Older adults with less WASO/night also had less within-person variations in Color Dot (p<0.001), Symbol Match (p<0.001) and Color Shape performance (p=0.01). Conclusion: Ambulatory cognitive performance assessed using EMA was related to actigraphic sleep. Poor sleep health may be a target for prevention of early cognitive changes that may precede onset of cognitive impairment and AD. Support: Research was supported by the National Institute on Aging (NIA) award numbers P01AG003949 and R01AG056538. 0859 TYPES OF CHILDHOOD MALTREATMENT AND SLEEP REGULATION DURING PREGNANCY Touchette, E. 1 Servot, S. 2 Lemieux, R. 3 Berthelot, N. 4 1 Department of Psychoeducation, Université du Québec à Trois-Rivières, Quebec, QC, CANADA, 2 Department of Psychoeducation, Université du Québec à Trois-Rivières, QC, CANADA, 3 Department of Nursing, Univeristé du Québec à Trois-Rivières, QC, CANADA, 4 Department of Nursing, Université du Québec à Trois-Rivières, QC, CANADA. Introduction: Pregnant women with history of childhood maltreat- ment would have around 2-fold increased odds of poor subjective sleep in comparison to pregnant women without history of trauma (Gelaye et al., 2015). Our aim was to evaluate whether different types of childhood maltreatment were associated with poorer sub- jective and objective sleep regulation during the second trimester of pregnancy. Methods: Sleep regulation between 18-20 weeks of gestation was assessed in a sample of 55 expectant mothers, including 31 women exposed to childhood maltreatment. Three measures of sleep were administered: 7-day actigraph measures (Mini-Mitter/Respironics), 7-day sleep diary and the completion of Pittsburgh Sleep Quality Index. Childhood maltreatment was assessed using the Chilhood Trauma Questionnaire. Generalized linear regression models were used to examine the associations between sleep measures and types of childhood maltreatment after adjusting for confounding vari- ables (e.g., maternal age, maternal wellbeing, education attainment and family income). Results: Among the 31 participants with history of childhood maltreatment, 71% (n=22) reported emotional abuse, 26% (n=8) physical abuse, 39% (n=12) sexual abuse, 42% (n=13) emotional neglect and 65% (n=20) physical neglect. Pregnant women with childhood emotional abuse had around 2.8 higher score on PSQI in comparison to pregnant women without childhood emotional abuse (P<0.003). For objective sleep measures, pregnant women with childhood sexual abuse had around 1 hour less of nocturnal sleep (P<0.004), 30 minutes more nocturnal awakenings (P<0.03) and 6% less of sleep efficiency (P<0.01) compared with pregnant women without childhood sexual abuse. Conclusion: Emotional abuse during childhood was associated with poorer perceived sleep quality during the 2nd trimester of pregnancy while childhood sexual abuse was particularly asso- ciated with objective measures of sleep regulation. Future larger studies are needed to confirm the impact of the different types of childhood maltreatment on maternal sleep quality during pregnancy. Support: Social Sciences and Humanities Research Council (SSHRC, 2018-2020, Canada) 0860 SLEEP DISORDERS IN FEMALE MILITARY PERSONNEL Villarreal, B. 1 Foster, S. 1 Hansen, S. 1 Brock, M. 1 Sanchez, H. 1 Gerwell, K. 3 Carrizales, F. 3 Peterson, A. 3 Pruiksma, K. 3 Mysliwiec, V. 1 1 San Antonio Military Healthcare System, Lackland AFB, TX, 2 San Antonio Military Healthcare System, Lackland AFB, TX, 3 University of Texas Health Science Center at San Antonio, San Antonio, TX, 4 University of Texas Health Science Center at San Antonio, San Antonio, TX. 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