Is CLOCK useful for Müdigkeit?

CLOCK gene variants (e.g., rs1801260) are linked to circadian rhythm regulation and can influence sleep-wake patterns. Studies show weak to moderate associations with chronotype (morningness/eveningness) and sleep quality, but effect sizes are small and heavily modulated by environment (light, diet, stress). For fatigue as a symptom, CLOCK is not a direct or clinically actionable marker. A DNA test may offer insights into your natural daily rhythm, but it does not replace medical evaluation for chronic fatigue (e.g., sleep apnea, iron deficiency, thyroid issues). Evidence is based on GWAS and mechanistic studies, not robust RCTs. Thus: useful for self-awareness, but insufficient for specific supplement or diet recommendations.