What role does FADS1 play in sleep?

FADS1's role in sleep is indirect, mediated through fatty acid metabolism. FADS1 encodes delta-5 desaturase, which converts alpha-linolenic acid into EPA and DHA. Omega-3 fatty acids (especially DHA) influence melatonin synthesis and reduce inflammation, both of which can affect sleep quality and circadian rhythms. Observational studies link higher omega-3 levels to better sleep outcomes, but direct evidence for FADS1 variants is limited. No large GWAS have established a robust association between FADS1 SNPs and sleep traits. The effect size is likely small and confounded by diet, lifestyle, and polygenic factors. Therefore, a DNA test for FADS1 does not provide actionable sleep advice. For improving sleep, focus on overall diet rich in omega-3s, sleep hygiene, and medical evaluation if needed. Evidence: human-moderate (omega-3 and sleep), but insufficient for FADS1 specifically.