What do studies say about Schlaf Genetik?

Sleep genetics is a complex field. Studies show that single gene variants like CLOCK rs1801260 can have a weak but statistically significant influence on chronotype. However, the effect size is small and the variant is common in European populations. Sleep is polygenic and heavily influenced by environmental factors such as light exposure, stress, and sleep hygiene. Direct-to-consumer tests that promise personalized sleep optimization based on single SNPs often overstate clinical relevance. Even with established associations (e.g., GWAS), predictive power for an individual is low. A cortisol test can indicate circadian rhythm dysregulation but does not replace medical diagnosis. The overall evidence is moderate: reproducible associations exist, but no clinically actionable recommendations arise from genetics alone. Anyone looking to improve sleep should focus on sleep hygiene, consistent bedtimes, and stress management – not genetic tests.