Myths vs facts: VDR and Schlaf

The vitamin D receptor (VDR) gene is often linked to sleep, but the evidence is limited. Myths: A VDR test can predict poor sleep or that vitamin D alone will fix sleep issues. Facts: Some VDR polymorphisms (e.g., FokI, BsmI) show weak associations with sleep quality, but effect sizes are small. Sleep is influenced by many genes, circadian rhythm, stress, and lifestyle. A DNA test cannot diagnose or predict sleep problems. Vitamin D deficiency is a known risk factor for sleep disorders, but supplementation should be based on blood levels, not genetics. Most DTC claims about VDR and sleep are overhyped and lack clinical utility. Bottom line: VDR is a minor piece of a complex puzzle. Rely on medical advice and proven sleep hygiene.