The Effects of Genetic Background for Diurnal Preference on Sleep Development in Early Childhood

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Morales-Munoz , I , Kantojärvi , K , Uhre , V-M , Saarenpää-Heikkilä , O , Kylliäinen , A , Pölkki , P , Himanen , S-L , Karlsson , L , Karlsson , H , Paavonen , E J & Paunio , T 2021 , ' The Effects of Genetic Background for Diurnal Preference on Sleep Development in Early Childhood ' , Nature and Science of Sleep , vol. 13 , no. 13 , pp. 219-228 .

Title: The Effects of Genetic Background for Diurnal Preference on Sleep Development in Early Childhood
Author: Morales-Munoz, Isabel; Kantojärvi, Katri; Uhre, Veli-Matti; Saarenpää-Heikkilä, Outi; Kylliäinen, Anneli; Pölkki, Pirjo; Himanen, Sari-Leena; Karlsson, Linnea; Karlsson, Hasse; Paavonen, E. Juulia; Paunio, Tiina
Contributor organization: HUS Children and Adolescents
Children's Hospital
University of Helsinki
Helsinki University Hospital Area
University Management
HUS Psychiatry
Department of Psychiatry
SLEEPWELL Research Program
Faculty of Medicine
Date: 2021
Language: eng
Number of pages: 10
Belongs to series: Nature and Science of Sleep
ISSN: 1179-1608
Abstract: Purpose: No previous research has examined the impact of the genetic background of diurnal preference on children´s sleep. Here, we examined the effects of genetic risk score for the liability of diurnal preference on sleep development in early childhood in two population-based cohorts from Finland. Participants and methods: The primary sample (CHILD-SLEEP, CS) comprised 1420 infants (695 girls), and the replication sample (FinnBrain, FB; 962 girls) 2063 infants. Parent-reported sleep duration, sleep-onset latency and bedtime were assessed at three, eight, 18 and 24 months in CS, and at six, 12 and 24 months in FB. Actigraphy-based sleep latency and efficiency were measured in CS in 365 infants at eight months (168 girls), and in 197 infants at 24 months (82 girls). Mean standard scores for each sleep domain were calculated in both samples. Polygenic risk scores (PRS) were used to quantitate the genetic risk for eveningness (PRSBestFit) and morningness (PRS10kBest). Results: PRSBestFit associated with longer sleep-onset latency and later bedtime, and PRS10kBest related to shorter sleep-onset latency in CS. The link between genetic risk for diurnal preference and sleep-onset latency was replicated in FB, and meta-analysis resulted in associations (P<0.0005) with both PRS-values (PRSBestFit: Z=3.55; and PRS10kBest: Z=-3.68). Finally, PRSBestFit was related to actigraphy-based lower sleep efficiency and longer sleep latency at eight months. Conclusion: Genetic liability to diurnal preference for eveningness relates to longer sleep-onset during the first two years of life, and to objectively measured lowered sleep efficiency. These findings enhance our understanding on the biological factors affecting sleep development, and contribute to clarify the physiological sleep architecture in early childhood.
Subject: 3123 Gynaecology and paediatrics
genetic risk
early childhood
3112 Neurosciences
3124 Neurology and psychiatry
Peer reviewed: Yes
Rights: cc_by_nc
Usage restriction: openAccess
Self-archived version: publishedVersion

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