If you are thinking about adding a standalone selenium supplement, I have had a lot of success with recommending Selenium from Pure Encapsulations , at a dose of 200 mcg per day
Researchers at those dose levels either need to split the dose into two injections or use a different reconstitution volume
Aquat Toxicol 9:91103 Ankley GT, Bennett RS, Erickson RJ, Hoff DJ, Hornung MW, Johnson RD, Mount DR, Nichols JW, Russom CL, Schmieder PK, Serrano JA, Tietge JE, Villeneuve DL (2010) Adverse outcome pathways: a conceptual framework to support ecotoxicology research and risk assessment
Unlike sedatives, it promotes the natural architecture of sleep by modulating circadian rhythms, neurotransmitters, and stress response systemswithout causing addiction or tolerance