"Multi-disciplinary research has revealed that electrically conductive contact of the human body with the surface of the Earth (grounding or earthing) produces intriguing effects on physiology and health. Such effects relate to inflammation, immune responses, wound healing, and prevention and treatment of chronic inflammatory and autoimmune diseases.
Findings to date
Grounding appears to improve sleep, normalize the day–night cortisol rhythm, reduce pain, reduce stress, shift the autonomic nervous system from sympathetic toward parasympathetic activation, increase heart rate variability, speed wound healing, and reduce blood viscosity. A summary has been published in the Journal of Environmental and Public Health."
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4378297
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