Ah! Good stuff. I've had grounding mats in the past. I didn't know this pillow was sufficiently grounded, so I was skeptical. Interesting experience I had once, I had gone up to my roof to sunbathe and use the grounding mat (it was the first time I tried it on the roof, the grounding wire running all the way to the soil). But since I live close to high voltage power lines, like 15-20 feet directly from where I was laying down... My back erupted in these weird rashes. Specifically the area that WASNT touching the mat. I think that whatever dirty electricity or ambient ionized air or something was using my body as a "lightning rod." I became insanely itchy, and the rash looked like reddish inflamed lumps of skin, in large patches sometimes. I didn't really consciously recognize until after 10-15 minutes that this might be happening. Interesting to note, personality wise I was extremely jittery and fidgety to the point of extreme discomfort. Twitching and snapping my head around at every noise. After evaluating the rashes in sheer surprise and confusion, I went outside and laid on a patch of wet soil/grass (farther away from the power lines). I basically forced myself to lie still and wait out the charge disparity. In about 2-3 minutes I fell into an almost complete trance / meditation / nap state for 10ish minutes. By then, I awoke and was normalized for the most part, the rashes no longer itched and many of them had "de-inflamed," although still somewhat red for the next hour Needless to say this experience was quite enlightening to the power of grounding in the proper environment