How are Selen and Schlaf related?

The relationship between selenium and sleep is not supported by strong clinical evidence, but plausible mechanistic links exist. Selenium is an essential trace element that serves as a cofactor for selenoproteins such as glutathione peroxidases and thioredoxin reductases, which are critical for antioxidant defense, particularly against mitochondrial oxidative stress. A genetic variant (rs4880 in the SOD2 gene) affects mitochondrial superoxide dismutase activity and thus susceptibility to oxidative stress. Since oxidative stress is associated with sleep disturbances (e.g., through inflammatory pathways or melatonin degradation), optimal selenium status might indirectly support sleep quality. However, no randomized controlled trials have demonstrated a causal effect of selenium supplementation on sleep parameters. The evidence is based on mechanistic reasoning and animal studies. For consumers: a balanced diet with selenium-rich foods (e.g., Brazil nuts, fish) is advisable, but excessive supplementation is not recommended due to selenium toxicity. The impact on sleep is individual and dominated by many other factors.