TY  - JOUR
PY  - 2013//
TI  - Genetic and environmental influences on daytime and nighttime sleep duration in early childhood
JO  - Pediatrics
A1  - Touchette, Evelyne
A1  - Dionne, Ginette
A1  - Forget-Dubois, Nadine
A1  - Petit, Dominique
A1  - Perusse, Daniel
A1  - Falissard, Bruno
A1  - Tremblay, Richard E.
A1  - Boivin, Michel
A1  - Montplaisir, Jacques Y.
SP  - e1874
EP  - 80
VL  - 131
IS  - 6
N2  - OBJECTIVES:To determine the relative contributions of genetic and environmental factors on daytime and nighttime continuous sleep duration at 6, 18, 30, and 48 months of age, and to identify different subgroups of children who followed different daytime and nighttime sleep duration trajectories and to investigate their etiology.  METHODS:The current study included 995 twins (405 monozygotic and 586 dizygotic) of the Quebec Newborn Twin Study recruited from the birth records of the Quebec Statistics Institute. Daytime and nighttime sleep was assessed through maternal reports at 6, 18, 30, and 48 months of age. A semiparametric modeling strategy was used to estimate daytime and nighttime sleep duration trajectories. Quantitative genetic models were used to examine to what extent genetic and environmental factors influenced daytime and nighttime continuous sleep duration.  RESULTS:Genetic modeling analyses revealed environmental influences for all daytime sleep duration trajectories. In contrast, strong genetic influences were found for consolidated nighttime sleep duration (except at 18 months and for the short-increasing sleep duration trajectory).  CONCLUSIONS:This is the first indication that early childhood daytime sleep duration may be driven by environmental settings, whereas the variance in consolidated nighttime sleep duration is largely influenced by genetic factors with a critical environmental time-window influence at ∼18 months.<p />  <p>Language: en</p>
LA  - en
SN  - 0031-4005
UR  - http://dx.doi.org/10.1542/peds.2012-2284
ID  - ref1
ER  -