Here is something to read about 'grounding' or 'earthing' from a physics perspective.
http://scienceblogs.com/principles/2...bunch-of-crap/

Earthing is quite different than PEMF's although both are frequently promoted by the same sources and have overlapping concepts. Some say PEMF therapy is like earthing on steroids.

Some EMF's are considered problematic. Others say there is no risk. Electric blankets and electric mattress pads emit EMF's in the 50 or 60 Hz range and some suggest turning them off before getting in bed. I turn mine off, just in case. I appear to sleep better with it off. Could be the faint smell given off by the electric mattress pad when it is on.
http://www.electricblanketinstitute....fety-care.html

Here is something to read about EMF's. 60 Hz and below are considered Extremely low frequency (ELF) EMF's.
http://www.cancer.gov/cancertopics/c...lds-fact-sheet

Oddly, Dr Mercola speaks about the benefits of PEMF, http://articles.mercola.com/sites/ar...grounding.aspx
Grounding http://articles.mercola.com/sites/ar...el-better.aspx
and the problems with ELF EMF's. http://articles.mercola.com/sites/ar...nket-safe.aspx

I find it interesting that some people can advocate for both sides of the same argument and make a pile of money doing it.

I am definitely not taking sides on this publicly other than to say, guard your wallet.

The treatment I would like to find more information and studies about is Near Infrared LED light therapy.

Read up and enjoy.