Myths vs facts: COMT and Schlaf

COMT (catechol-O-methyltransferase) degrades dopamine and other catecholamines. The common rs4680 (Val158Met) polymorphism alters enzyme activity: Val/Val = high activity, Met/Met = low activity. A common myth is that Met/Met carriers sleep better because of higher dopamine levels. The evidence is mixed: some studies associate Met/Met with better sleep efficiency and fewer awakenings, while others find no or opposite effects. Additionally, COMT interacts with caffeine: Val/Val individuals metabolize caffeine faster and may experience less sleep disruption after caffeine intake. The evidence is moderate (human association studies, not causal). Consumer DNA tests often oversimplify, ignoring that sleep is influenced by many genes, circadian rhythm, stress, and lifestyle. A COMT test alone is not a reliable tool for sleep optimization. Safety note: persistent sleep problems should be evaluated by a healthcare professional, not solely via genetic testing.