The following is a source of information on this grounding stuff:
http://www.groundology.com/videos?show=body-voltage#video
References
[1] Chevalie G, Sinatra ST, Oschman JL, et al.: Earthing (grounding) the human body reduces blood viscosity—a major factor in cardiovascular disease. J Altern Complement Med 2013;19:102–110.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3576907/