What role does MTHFR play in sleep?

MTHFR (methylenetetrahydrofolate reductase) is a key enzyme in folate and homocysteine metabolism. Some research suggests an indirect link to sleep because methylation affects neurotransmitter synthesis, including serotonin and melatonin. However, direct evidence for MTHFR variants (e.g., C677T) influencing sleep quality or disorders is weak and inconsistent. Most findings come from observational studies, not RCTs. A consumer DNA test like MyBody-X cannot reliably predict sleep outcomes based on this SNP alone. Blood homocysteine levels and lifestyle factors are more informative. Caution: Do not start supplements (e.g., methylfolate) based solely on genotype without medical guidance.