Myths vs facts: COMT and sleep

COMT (catechol-O-methyltransferase) degrades dopamine. The common rs4680 (Val158Met) variant alters enzyme activity: Met/Met carriers have lower activity and higher prefrontal dopamine. This has been linked to better cognitive flexibility but also higher anxiety and potentially altered sleep architecture. Some studies suggest Met/Met individuals are more vulnerable to sleep deprivation and may have lower sleep efficiency. However, effect sizes are small, findings are inconsistent, and the evidence does not support personalized sleep recommendations based solely on COMT. The myth that COMT genotype determines your chronotype or ideal sleep duration is not scientifically supported. Sleep is influenced by many factors: light exposure, stress, hormones, lifestyle. A single COMT SNP is not clinically actionable for sleep optimization. Evidence: human-moderate. Caveat: No clinical recommendation based on this SNP alone.