I too love the Earthing technology. You can actually use a volt meter to test whether you are being grounded or not with the Earthing sheet. I've been sleeping on one for 2 months and I really like it. I feel like my body warms up from the inside, which is great b/c I tend to be on the cold side. I made a video on this, at http://www.amandashealthjournal.com/how-to-set-up-your-earthing-sheet/