Can Selen help with sleep?

Based on the provided context, there is no direct evidence that selenium can improve sleep. The context covers DNA tests for metabolism, FTO, MC4R, CLOCK, FOXO3, and vitamin D, but not selenium or sleep. Generally, selenium is an essential trace mineral important for thyroid function and antioxidant defense. Some studies suggest a possible link between selenium deficiency and sleep disturbances, potentially via melatonin synthesis or oxidative stress. However, the evidence is mostly mechanistic and insufficient for a clear recommendation. Direct benefit of selenium supplements for sleep is not established. If deficiency is suspected, blood levels should be tested, as excess selenium can be toxic (selenosis). MyBody-X tests for selenium are not mentioned in the given context, so their utility for sleep issues is unclear.