A Longitudinal Study of Stress During Pregnancy, Children's Sleep and Polygenic Risk for Poor Sleep in the General...

Area of Science:

• Developmental Psychology
• Sleep Science
• Genetics

Background:

• Early life stress is a known factor impacting sleep throughout life.
• Emerging evidence suggests prenatal stress may initiate sleep disturbances in utero.
• Understanding the long-term effects of prenatal stress on child sleep is crucial.

Purpose of the Study:

• To investigate the longitudinal associations between prenatal psychosocial stress and sleep problems in children.
• To examine if genetic liability for poor sleep interacts with prenatal stress to affect sleep outcomes.
• To determine the persistence and nature of sleep disturbances from infancy through childhood.

Main Methods:

• Utilized data from the Generation R population-based birth cohort.
• Collected caregiver-reported data on prenatal psychosocial stress and child sleep at multiple time points (2 months to 6 years).
• Employed polygenic risk scores for sleep traits in a subset of the sample to assess genetic interactions.

Main Results:

• Prenatal stress showed consistent associations with increased sleep problems across all assessed ages, with effect sizes ranging from small to medium.
• Prenatal stress was linked to shorter sleep duration in infancy (2 months) and early childhood (2 years), but not at 3 years.
• A significant interaction was found between prenatal negative life events and polygenic risk for insomnia, exacerbating sleep problems by age 6.

Conclusions:

• Prenatal psychosocial stress negatively impacts children's sleep, with effects persisting throughout childhood.
• Genetic predisposition for insomnia can amplify the negative effects of prenatal stress on sleep.
• The prenatal environment plays a significant role in the development of sleep regulation, suggesting potential for early interventions in high-risk pregnancies.