0732 Sleep multi-trajectories of couples up to 36 months postpartum and their covariates: the SEPAGES cohort study

Abstract Introduction Parents reported degraded sleep outcomes up to several years after child birth. Most published studies were cross-sectional, in early post-partum and focusing on maternal-child dyads. We aimed at identifying sleep multi-trajectories (SMT) including night (NSD) and daytime (DSD) sleep duration and subjective sleep loss (SSL) between 3 and 36 months postpartum in couples from the SEPAGES cohort. Methods From 484 mothers and 410 fathers included in the SEPAGES cohort, sleep information was collected by self-reports at 3, 18, 24 and 36 months postpartum. Couple SMT were modelled using Group-Based Trajectory Modelling method. Each couple was assigned to the group of SMT with the highest probability of belonging to. Multinomial logistic regression assessed sociodemographic, parental and child covariates associated SMT Results Three groups SMT were identified in couple who reported sleep data at least 2 times across the 4 time-points (N=188). In G1 (29.3%), couples had 8-9hr of mean NSD and a stable and relatively short mean maternal and paternal DSD (≈10min and ≈5min, respectively) while SSL was decreasing for mother (58% to 31%) but stable for father (≈30%) between 3 and 36 months postpartum. In G2 (27.7%), they had a stable but relatively short mean NSD (7-8hr), a maternal DSD decreasing by 20min between 3 and 18 months then being stable at 23min, a stable paternal DSD (≈10min) and high but decreasing SSL from 90% to 86% for mothers and 76% to 61% for fathers. In G3 (43.0%), couples had a stable mean NSD (8-9hr), a relatively long mean DSD, decreasing from 54 to 41min for mothers but increasing from 28 to 39min for fathers, and a stable but relatively high SSL (≈70% for mothers and ≈55% for fathers). From logistic regression, belated paternal chronotype increased odds for belonging to G2 while having a first child and born in autumn decreased odds to belong to G2 compared to G1. Conclusion We identified 3 different SMT between 3 and 36 months postpartum for the first time. We found several factors associated with each SMT. Studies are still warranted to investigate further interrelation with the child sleep patterns. Support (if any) -