Night sleep duration trajectories and associated factors among preschool children from the EDEN cohort

Sleep duration may vary both interindividually and intraindividually over time. We aimed to identify night-sleep duration (NSD) trajectories among preschoolers and to study associated factors. NSD was collected within the French birth-cohort study EDEN at ages 2, 3, and 5–6 years through parental questionnaires, and were used to model NSD trajectories among 1205 children. Familial socioeconomic factors, maternal sociodemographic, health and lifestyle characteristics, as well as child health, lifestyle, and sleep characteristics at birth and/or at age two years were investigated in association with NSD using multinomial logistic regressions. Five distinct NSD trajectories were identified: short (SS,