A new study of twins suggests that insomnia in childhood and adolescence is partially explained by genetic factors.

Results show that clinically significant insomnia was moderately heritable at all stages of the longitudinal study. Genetic factors contributed to 33 to 38% of the insomnia ratings at the first two stages of the study, when participants had an average age of 8 to 10 years. The heritability of insomnia was 14 to 24% at the third and fourth follow-up points, when the average age of participants was 14 to 15 years. The remaining source of variance in the insomnia ratings was the non-shared environment, with no influence of shared, family-wide factors.

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