Japanese Journal of Health and Human Ecology
Online ISSN : 1882-868X
Print ISSN : 0368-9395
ISSN-L : 0368-9395
Original Articles
Genetic and environmental influences on sleeptalking, half-sleeping, night terrors, and nocturnal enuresis in childhood
—A study of two Japanese twin samples—
Syuichi OOKI
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2008 Volume 74 Issue 3 Pages 130-145


The purpose of this study was to clarify genetic contributions to the childhood behavioral phenomena of sleeptalking, half-sleeping, night terrors, and nocturnal enuresis using the two largest databases of Japanese twins. The subjects were children of members of several maternal associations for multiples, including 765 pairs ranged in age from 3 to 15 years with a mean age of 7.0 years, as well as school applicants, including 1,140 twin pairs 11-12 years of age. All data were gathered by questionnaire. Structural equation modeling showed that the proportion of total phenotypic variance attributable to genetic influences was 88-96% regarding sleeptalking, 62-91% regarding half-sleeping, and 70-91% regarding night terrors, which were higher in the school applicants group than in the maternal associations group. Age and gender difference was suggested to impact nocturnal enuresis. Moreover, co-occurrence of sleeptalking, half-sleeping, and night terrors were attributed partly to common genetic or environmental factors for these three traits.

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© 2008 The Japanese Society of Health and Human Ecology
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