Sleep problems and anxiety from 2 to 8 years and the influence of autistic traits: a longitudinal study
Whether or not childhood sleep problems and anxiety occur simultaneously, or one precedes the other, and any effect of autistic traits on this relationship remains unclear. We investigated longitudinal associations between sleep and anxiety at 2 years and sleep and anxiety at 8 years controlling for demographic variables. We also examined the additional influence of autistic traits at 2 years on sleep problems and anxiety at 8 years. Participants were from the Western Australian Pregnancy Cohort (Raine) Study, where 2900 pregnant women were recruited between 1989 and 1991 and their children assessed every 2–3 years thereafter. Demographic information was provided at 16–18 weeks gestation. Children’s sleep and anxiety at 2 and 8 years and autistic traits at 2 years were measured using the Child Behavior Checklist. Hierarchical multiple regression models tested the prediction of both anxiety and sleep problems at 8 years. Sleep problems at 2 years and 8 years, anxiety at 2 years, and autistic traits at 2 years were significantly associated with anxiety at 8 years. Sleep problems at 2 years and anxiety at 8 years were significantly related to sleep problems at 8 years. Each of these models explained about 20% of variance. Childhood sleep problems, anxiety and autistic traits are interrelated and can occur concurrently in young children, but the best predictor of poor sleep in middle childhood is concurrent anxiety and vice versa. Anxiety and sleep problems may be an early indicator of autism in young children and early autistic traits may also contribute to anxiety problems later in childhood.
KeywordsSleep Anxiety Autistic traits Childhood
We would like to acknowledge the Raine Study participants and their families, the Raine Study team for cohort co-ordination and data collection, the NHMRC for their long-term contribution to funding the study over the last 25 years and the Raine Medical Research Foundation. Also the University of Western Australia, Curtin University, The Telethon Kids Institute, the UWA Faculty of Medicine, Dentistry and Health Sciences, the Women and Infants Research foundation, and Edith Cowen University for providing funding for core management of the Raine Study. AJOW is supported by a Senior Research Fellowship from the National Health and Medical Research Council (APP1077966). SMC is also supported by a Senior Research Fellowship (APP1136344).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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