How are ADH1B and sleep related?

ADH1B encodes alcohol dehydrogenase 1B, an enzyme that metabolizes ethanol. A direct causal link between ADH1B variants and sleep quality is not supported by strong human evidence. Some observational studies suggest that carriers of the faster-metabolizing ADH1B*2 variant (common in East Asians) may experience altered sleep architecture after alcohol consumption – e.g., less deep sleep or more awakenings. This effect is likely mediated by acetaldehyde accumulation rather than the gene itself. Without alcohol intake, a direct impact on sleep is unlikely. The evidence is primarily mechanistic and indirect. Consumer DNA tests that claim ADH1B predicts sleep quality often overstate clinical relevance. Sleep issues should be evaluated with sleep diaries, actigraphy, or polysomnography – not genetic testing alone.