Evidence check: COMT in the context of Schlaf

COMT (catechol-O-methyltransferase) is a key enzyme in dopamine breakdown. The well-studied Val158Met variant (rs4680) alters enzyme activity and has been linked to cognition, pain, and sleep. Some research suggests that Met carriers (lower activity) may experience altered sleep architecture or increased insomnia, but findings are inconsistent and often based on small samples or animal models. The evidence for a direct, clinically meaningful effect on sleep is weak and mixed. Consumer DNA tests can detect this variant, but the effect size is small and not actionable for sleep optimization. Sleep is influenced by numerous factors (stress, hormones, environment), so a single gene variant cannot provide reliable guidance. Be cautious of marketing claims that overstate COMT as a 'sleep gene'. For persistent sleep issues, medical evaluation is recommended.