WILL NOT WORK AS IT IS!
First of all, I'm a strong proponent of "grounding".  But the fact is, this product has multiple issues.  The most important of which is that the product will not (can not) work as it is.  They REALLY should have consulted someone who knows ANYTHING about electricity before releasing this.  The problem (as stated in another review here), is that there is no electrical connection between the grounding wire and the actual sheet.  The wire snaps to a connection on the sheet, but that's it.  The snap is not connected to the conductive threads in the sheet.  This is sort of like laying the plug of an appliance next to an outlet without actually plugging it in, and expecting the appliance to operate.  Doesn't work that way, there needs to be an actual electrical connection!  One solution to this, although I'm still not content with it, is to put a clamp on the snap to hold it against the threads in the sheet.  This works, but still a cheesy solution.  Secondly, the grounding wire that it comes with is of such small gauge that there is a lot of resistance (Ohms) in just the wire itself.  Not a good start to reach a ground especially with all of the added distance of house wiring until there's a true ground.  My solution to this one was to splice in better wire to the snap connection.  This got me down to about 1/40th of the resistance even with a longer run out to an actual grounding stake in the ground.  This brings me to a third problem.  Using the ground of house wiring is inherently noisy electrically speaking.  I won't go into the details of all of the possible causes of this, but if you were to look at this ground with an oscilloscope probe you would see what I'm talking about.  This probably explains some of the other reviews of people not even being able to sleep with the sheet.  If someone is especially sensitive to this sort of noise, which many are, it will certainly disturb sleep.  This is why I opted for an actual Earth ground using a copper grounding rod in the ground outside of the bedroom window.  Anyway, with all of that said, there are work arounds, but DON'T EXPECT THIS PRODUCT TO WORK AS IS!
Rating: 2 stars