{"doi":"10.1111/ijpo.12650","title":"Bedtime, body mass index and obesity risk in preschool‐aged children","abstract":"BACKGROUND: Although sleep duration is a risk factor for obesity in young children, less is known about other aspects of sleep health, including bedtime, on obesity risk. OBJECTIVE: To determine whether bedtime is associated with body mass index (BMI) z-score or obesity risk in children ages 2 to 5 years, and to determine if associations are independent of sleep duration. METHODS: Cohort analyses were undertaken using three early life obesity prevention trials (POI, INSIGHT, Healthy Beginnings) and a longitudinal cohort study (HOME). Bedtime was assessed by questionnaire and BMI through clinical measurement between 2 and 5 years in 1642 children. Adjusted regression models examined whether BMI z-score and obesity (BMI z-score ≥ 2) were associated with bedtime, nocturnal sleep time and 24-hour sleep time. A discrete mixture model categorized children into bedtime trajectory groups across time points. RESULTS: Bedtime was inconsistently associated with BMI z-score. Although each hour later of bedtime was associated with greater odds of obesity at ages 3 (OR; 95% CI: 1.05; 1.003, 1.10) and 5 (1.35; 1.08, 1.69) years, odds were attenuated after adjustment for nocturnal or 24-hour sleep time. Longer nocturnal sleep duration at 2 years was associated with lower odds of obesity (OR 0.90; 0.86, 0.94), as was longer 24-hour sleep duration at 3 years in girls (0.70; 0.62, 0.78). BMI z-score and odds of obesity were not significantly different between 'early to bed' and 'late to bed' trajectory groups. CONCLUSIONS: Timing of bedtime appears inconsistently related to obesity in young children, possibly via influencing overall sleep duration.","journal":"Pediatric Obesity","year":2020,"id":76345,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":21,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.8596,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2020-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":397988,"name":"Jillian J. Haszard","orcid":"0000-0001-6312-7795","position":1,"is_corresponding":false},{"id":336336,"name":"Jennifer S. Savage","orcid":"0000-0002-2912-8687","position":2,"is_corresponding":false},{"id":301982,"name":"Kimberly Yolton","orcid":"0000-0002-4458-0516","position":3,"is_corresponding":false},{"id":397989,"name":"Dean W. Beebe","orcid":"0000-0001-5740-8769","position":4,"is_corresponding":false},{"id":378251,"name":"Yingying Xu","orcid":"0000-0001-5247-3721","position":5,"is_corresponding":false},{"id":397990,"name":"Barbara C. Galland","orcid":"0000-0002-2376-3575","position":6,"is_corresponding":false},{"id":336335,"name":"Ian M. Paul","orcid":"0000-0002-6344-8609","position":7,"is_corresponding":false},{"id":376361,"name":"Jodi A. Mindell","orcid":"0000-0001-7628-815X","position":8,"is_corresponding":false},{"id":397991,"name":"Seema Mihrshahi","orcid":"0000-0001-6567-9884","position":9,"is_corresponding":false},{"id":397992,"name":"Li Ming Wen","orcid":"0000-0003-1381-4022","position":10,"is_corresponding":false},{"id":397993,"name":"Barry Taylor","orcid":"0000-0002-6450-8677","position":11,"is_corresponding":false},{"id":397994,"name":"Rosalina Richards","orcid":"0000-0002-3716-811X","position":12,"is_corresponding":false},{"id":397995,"name":"Lisa Te Morenga","orcid":"0000-0003-3526-0091","position":13,"is_corresponding":false},{"id":397996,"name":"Rachael W. Taylor","orcid":"0000-0001-9516-2253","position":14,"is_corresponding":false},{"id":397987,"name":"Melyssa Roy","orcid":"0000-0003-1399-3091","position":0,"is_corresponding":true}],"reference_count":51,"raw_metadata":null,"created_at":"2026-07-18T21:47:46.469293Z","pmid":"32372572","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}