Associations Between Sleep Traits and Social Isolation: Observational and Bidirectional Mendelian Randomization Study

Area of Science:

• Epidemiology
• Genetics
• Sleep Science

Background:

• Observational studies suggest a link between social isolation and sleep disturbances.
• The causal relationship and directionality between social isolation and sleep traits remain unclear.

Purpose of the Study:

• To investigate the causal association between social isolation and multiple sleep traits using a bidirectional Mendelian randomization approach.
• To determine if insomnia causally influences social activity or vice versa.

Main Methods:

• Utilized data from the Guangzhou Biobank Cohort Study (n=30,430) for observational analysis.
• Employed bidirectional Mendelian randomization (MR) with genetic instrumental variables for social activities (sports club, religious group, pub/social club) and insomnia.
• Leveraged large-scale genetic data from UK Biobank and 23andMe for MR analysis.

Main Results:

• Observationally, insomnia and poor sleep quality were associated with higher social isolation scores.
• Genetically predicted insomnia causally reduced the likelihood of attending sports clubs and religious groups.
• No significant association was found between social activities and insomnia in the MR analysis.

Conclusions:

• The study provides evidence for a causal effect of insomnia on reduced social activity.
• Findings suggest that insomnia may contribute to social isolation.
• Further research is warranted to explore insomnia treatment's efficacy in mitigating social isolation.