sleep on it directly
In one of the reviews they said they put it under the the fitted sheet.  I laid mine on top on the fitted sheet and lay on it directly and make sure my bare arms and legs touch it.  When I used the tester to test the sheet it doesn't light up if there is a sheet over it.  I lay directly on it and I sleep a lot better and my legs don't ache anymore.  My 93 yr. old mom doesn't have to take her Plavix anymore because it thinned her blood naturally.  My daughter has restless leg syndrome and she said that went away and all they use is the grounding pad on their legs.  I could go on and on with all the health benefits it has brought to all three of us.  I works and I highly recommend it.  Sleep directly on it.
Rating: 5 stars