Is Longevity DNA Test useful for Schlaf?

A Longevity DNA test for sleep is not clinically useful. Genetics explain only a small fraction of sleep variability (GWAS with small effect sizes). Such tests often provide generic advice (e.g., 'melatonin sensitive') without strong evidence. Better approaches: sleep diary, actigraphy, or medical sleep evaluation. Caution: Do not change supplements or medications based on test results. Evidence: human-moderate/GWAS.