A311 SLEEP, Volume 42, Abstract Supplement, 2019 B. Clinical Sleep Science and Practice VII. Pediatrics levels with TST&ge16hrs/24h compared to high levels. Community and nursery assistant childcare at age 1 year were positively asso- ciated 1-to-2 NW/week. Single parenting and being a full-time working mother were negatively associated with NW whatever the frequencies while being part-time working was positively associ- ated with SOD. Incomes or parental birthplace were not associated with infant sleep patterns. Conclusion: Several familial factors, refecting socioeconomic and sociocultural environment, were associated with infants sleep pat- terns as early as 1 year old in France. Study of associations’ persis- tence over time would be interesting. Support (If Any): N/A 0774 NIGHT-SLEEP DURATION TRAJECTORIES AND BEHAVIOR IN PRESCHOOL-AGED CHILDREN FROM THE EDEN COHORT Eve Reynaud, PhD, Anne Forhan, Barbara Heude, PhD, Marie- Aline A. Charles, MD, PhD, Sabine Plancoulaine, MD, PhD INSERM U1153, EARoH team, Villejuif, France. Introduction: The association between sleep and behavior has been extensively studied in adolescents and school-aged children, but very little attention has been given to preschoolers. A systematic review of the literature allowed us to identify 10 articles describ- ing the link between sleep duration and behavior in preschool aged children, with only 2 from the same team using a longitudinal design. Methods: Within the French birth-cohort study EDEN, repeated measures of children’s night-sleep duration were collected at age 2, 3 and 5-6 through parental questionnaires, and were used to model night-sleep duration trajectories. Behavior was assessed with the “Strengths and Diffculties Questionnaire” which provides 5 sub- scales measuring a child’s conduct problems, emotional symptoms, peer relation problems, antisocial behavior and hyperactivity/atten- tion problems. The behavioral subscales were dichotomized at the higher 25th percentile. Multivariable logistic regressions, adjusted for parents’ socio-economic factors, parental characteristics, chil- dren’s characteristics and sleep habits, allowed us to study in 1021 children (53.9% boys) the association between night-sleep duration trajectories from 2 to 5-6 and behavior at age 5-6. Results: Five distinct night-sleep duration trajectory groups were identifed: short- (SS, &lt10hrs, 5.0%), medium-low- (MLS, &lt11hrs, 48.4%), medium-high- (MHS, &eq11hrs30, 37.0%), long- (LS, &ge11hrs30, 4.3%) and modifer sleepers (MS, i.e. LS then MLS, 5.3%). After controlling for potential cofounders and baseline behavior at age 2, children belonging to the SS and MLS compared to MHS trajectories had, at age 5-6, increased risk of presenting hyperactivity/ inattention problems. This was observed only in boys (OR 2.8, 95%CI [1.2-6.8], and OR 2.2 [1.3-3.6], respec- tively; p trajectories-gender interaction =0.02). Conclusion: Results suggest that the persistence of night-sleep dura- tion &lt11hrs/night in preschool years is positively associated with more hyperactivity/inattention behavior, especially among boys. Support (If Any): N/A 0775 FAMILY MATTERS: PARENTAL MONITORING, CHRONOTYPE, AND DAILY RHYTHMICITY Kenda Eberhardt, BS 1 , Heather E. Gunn, PhD 2 1 Psychology Department, University of Alabama, Tuscaloosa, AL, USA, 2 University of Alabama, Tuscaloosa, AL, USA. Introduction: Consistent timing of daily activities (daily rhythmic- ity) and an earlier chronotype, are benefcial for physical and men- tal well-being in adolescents. Family relationships (e.g., couples, mothers and infants) are linked to individual daily rhythmicity and chronotype. However, less is known about adolescent chronotype and daily rhythmicity in the context of the parent-adolescent dyad. We examined how parental monitoring, an important dimension of the parent-adolescent relationship, infuences sleep preferences, and how sleep preferences infuence daily rhythmicity. Methods: Thirty-one parents (mean age = 43.81) and their young adolescents (mean age = 12.26) completed an assessment of parental awareness of adolescents’ waking plans and activ- ities. Chronotype was assessed with midsleep on free days using the Munich Chronotype Questionnaire. Daily rhythmicity was assessed using the Social Rhythm Metric. We used multi-level modeling to test two Actor-Partner Interdependence Models. The frst model estimated the effects of parental monitoring on one’s own chronotype and on other’s chronotype. The second model esti- mated the effects of chronotype on one’s own rhythmicity and on other’s rhythmicity. Results: Adolescents who perceived more parental monitoring had a later chronotype (b = .474, SE=.187, p = .046). Parent-reported monitoring was not associated with either parent’s chronotype or their adolescent’s chronotype (all p’s > .05). Adolescents’ own ear- lier chronotype was associated with their own greater rhythmicity (b= -.601, SE= .229, p < . 001). Parents’ own chronotype was not associated with either parent’s rhythmicity or their adolescent’s rhythmicity (all p’s > .05). Conclusion: More parental monitoring (adolescent reported) is associated with an evening chronotype in adolescents. This sug- gests that young adolescents who are more delayed also have par- ents who are monitoring their daytime activities. Adolescents with an earlier chronotype had more consistent daily rhythms. The parent-adolescent dyad may be a novel target for addressing sleep preferences among adolescents. Support (If Any): This material is based upon work supported by the Sleep Research Society Foundation. 0776 A BEHAVIORAL INTERVENTION TO ENHANCE SLEEP IN SCHOOL-AGED CHILDREN: MODERATION BY CHILD ROUTINES Azeb Gebre 1 , Nicola Hawley 2 , Mary Carskadon 3 , Hollie Raynor 4 , Elissa Jelalian 3 , Judith Owens 5 , Rena R. Wing 3 , Chantelle N. Hart 1 1 Center for Obesity Research and Education, College of Public Health, Temple University, Philadelphia, PA, USA, 2 Department of Chronic Disease Epidemiology, Yale University, New Haven, CT, USA, 3 Department of Psychiatry and Human Behavior, Alpert Medical School, Brown University, Providence, RI, USA, 4 Department of Nutrition, University of Tennessee at Knoxville, Knoxville, TN, USA, 5 Department of Neurology and Center for Pediatric Sleep Disorders, Boston Children’s Hospital, Waltham, MA, USA. Introduction: Although mounting evidence suggests that a good night’s sleep has benefcial effects on children’s executive, behav- ioral, and emotional functioning, many US school-aged children do not achieve recommendations for sleep duration. We previously demonstrated that a brief behavioral intervention can improve children’s objectively estimated sleep time relative to controls; however, not all children achieved clinically meaningful changes in Downloaded from https://academic.oup.com/sleep/article/42/Supplement_1/A311/5451167 by guest on 01 February 2022