Maddren C.I.Dhamrait G.Ghogho M.Chong K.H.Jáuregui A.Veldman S.L.C.Venetsanou F.El Hamdouchi A.Hamzavi Zarghani N.Byambaa A.Mwase-Vuma T.Katewongsa P.Subedi N.Abdeta C.Chia M.Engberg E.Lubree H.Sultoni K.Singh P.Užičanin E.Tiongco M.M.Chelly M.S.Turab A.Aoko O.A.Kontsevaya A.Nusurupia J.J.Okely A.D.Mahidol University2025-11-162025-11-162025-01-01Behavioral Sleep Medicine (2025)15402002https://repository.li.mahidol.ac.th/handle/123456789/112987Objective: To examine the associations between parent perceived environmental factors, nighttime sleep duration and 24-h sleep duration among an international sample of preschool-aged children. Methods: Secondary analyses of cross-sectional data from preschoolers across 23 countries (19 LMICs), collected during the third pilot phase (January 2021–August 2024) of the SUNRISE Study. Parents completed a questionnaire which asked about their child’s sleep patterns and environmental factors that impacted their child’s sleep in the previous 3 days. Results: Data from 2,219 children were analyzed. A significant difference was observed between nighttime sleep (F = 14.27, p = <0.0001) and nap duration (F = 9.10, p = 0.0004) across country income level. Environmental factors such as heat (−12.87, 95% CI: −11.54, −0.61) and cold (−17.70, 95% CI: −34.53, −0.85) were negatively associated with nighttime sleep duration. Conclusions: Public health researchers and professionals should prioritize context-specific strategies to minimize the impact of weather conditions on sleep to promote healthy levels of sleep among preschoolers from diverse settings.PsychologyNeuroscienceMedicineArticleSCOPUS10.1080/15402002.2025.25769172-s2.0-10502074516915402010