Evidence check: ADH1B in the context of sleep

ADH1B encodes alcohol dehydrogenase, an enzyme that metabolizes ethanol. The well-studied variant rs1229984 (ADH1B*2) results in much faster conversion of alcohol to acetaldehyde, causing flushing, nausea, and discomfort, which typically reduces alcohol intake. Since alcohol is known to disrupt sleep architecture—suppressing REM sleep and causing fragmentation—individuals who drink less due to this genetic variant may experience better sleep quality indirectly. However, direct evidence linking ADH1B to sleep outcomes is scarce. The connection is mechanistic and indirect, mediated by drinking behavior rather than a direct effect on sleep regulation. Consumer DNA tests often oversimplify this. For actual sleep issues, focus on sleep hygiene, stress reduction, and medical evaluation rather than a single gene variant.