connecting the human body to the earth during sleep (earthing) normalizes the daily cortisol rhythm and improves sleep...reductions in pain and inflammation

http://mercola.com/sites/articles/archive/2012/09/20/barefoot-on-electron-deficiency.aspx

www.emfanalysis.com/is-grounding-good-for-you/

Do not use electric earthing mat. Wear a copper foiled iron or steel helmet and sleep on earth inside a steel shed. Or sleep on floor of an older house that has a crawl space instead of a concrete slab.