According to a study of twins published in the September issue of the journal SLEEP, insomnia in adults is partially explained by genetic factors, and this heritability is higher in females than in males. Results show that the estimated heritability of insomnia was 59 percent for females and 38 percent for males.

Read the study in SLEEP: A Longitudinal Twin Study of Insomnia Symptoms in Adults

Read the press release: Twin study suggests genetic factors contribute to insomnia in adults