Genetic Influences on Sleep Disorders
Summary
Sleep disorders encompass a spectrum of conditions—insomnia, narcolepsy, restless legs syndrome and variations in sleep duration—that bear a substantial genetic component. Twin and family studies consistently report moderate to high heritability estimates, indicating that genes account for a large proportion of inter-individual differences in sleep traits. Genome-wide association studies have uncovered multiple risk loci involved in circadian regulation, neurotransmitter signalling and sleep homeostasis. These variants exert small individual effects but act cumulatively in a polygenic framework, shaping risk profiles across populations. Epigenetic modifications and gene–environment interactions further modulate expression of sleep-related genes, linking genetic predisposition with factors such as stress, light exposure and shift work. Advancements in large-scale cohorts and continuous monitoring technologies are refining our understanding of genetic architecture, paving the way for personalised diagnostics and targeted chronobiological or pharmacogenomic therapies.
Research from Nature Portfolio
Recent studies have leveraged both continuous physiological monitoring and large clinical cohorts to quantify genetic contributions to sleep patterns. One investigation using temperature-activity-position sensors in twin pairs estimated heritability of daytime napping and nocturnal sleep parameters at around 60 – 70 %, highlighting a strong genetic influence on diurnal rest behaviours. In a genome-wide association analysis of diagnostic data from electronic health records, researchers identified novel risk loci for insomnia, estimated common single-nucleotide polymorphisms to explain approximately 7 % of phenotypic variance, and demonstrated genetic correlations between insomnia and substance-use disorders. Meta-analysis of multiple cohorts further expanded the catalogue of significant loci, underscoring the polygenic nature of insomnia and its overlapping genetic architecture with other neuropsychiatric traits.
Genetic Influences on Sleep Disorders publication trend
The graph below shows the total number of articles in genetic influences on sleep disorders across all publications each year (not limited to Nature Index journals).
Technical terms
Heritability: The proportion of variation in a trait attributable to genetic differences between individuals.
Genome-wide association study (GWAS): A method that scans the genome to identify genetic variants linked to a trait across large populations.
Polygenic risk score (PRS): A single numerical estimate of genetic liability derived from the combined effect of multiple risk variants.
Single-nucleotide polymorphism (SNP): A common type of genetic variation at a single base pair in the DNA sequence.
Epigenetics: The study of heritable changes in gene function that occur without alterations to the DNA sequence itself.
References
- Behaviour genetics and sleep: A narrative review of the last decade of quantitative and molecular genetic research in humans. Sleep Medicine Reviews (2023).
- Heritability of sleep duration and quality: A systematic review and meta-analysis. Sleep Medicine Reviews (2021).
- Heritability of siesta and night-time sleep as continuously assessed by a circadian-related integrated measure. Scientific Reports (2017).
- Genome-wide association analysis of insomnia using data from Partners Biobank. Scientific Reports (2020).
- Polygenic Risk for Insomnia in Adolescents of Diverse Ancestry. Frontiers in Genetics (2021).
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