Is Selen useful for Schlaf?

Whether selenium is useful for sleep cannot be answered with a clear 'yes' based on current evidence. Selenium is an essential trace mineral critical for thyroid function and antioxidant defense via selenoproteins. Severe selenium deficiency can indirectly impair sleep through disrupted thyroid hormone metabolism, potentially causing fatigue or sleep disturbances. However, no robust clinical trials demonstrate a direct sleep-enhancing effect of selenium in healthy individuals with adequate selenium status. Some small studies suggest possible benefits in older adults or those with low selenium levels, but the evidence is weak and inconsistent. Supplementation without prior testing is not advisable, as excessive selenium intake can be toxic (selenosis). For sleep issues, it is more effective to address sleep hygiene, stress, caffeine intake, or underlying medical conditions. Selenium status can be assessed via blood tests. The overall evidence for a direct effect on sleep is rated as mixed/unclear.