Update:
My wife wasn't too pleased with the bed linen getting a greenish hue within the week due to the all copper earthing material, so i had to think up a little different setup.
For several weeks now we both use just a piece of non-copper multi-strand electrical wire.
One end stripped for just a couple of centimeters, strands twisted, and screw clamped to the grounded central heating panel just behind our bed.
The other end stripped for about 25 centimeters, strands twisted, and made into a loose fitting wrist loop.
No more discoloration of the bed sheets, while still having the same improvement of sleep quality.
The ability to fall asleep more quickly, sleep better/deeper, dream every night, and wake up feeling rested instead of still tired is priceless to both us.
It's very well possible that we might buy two carbon fiber bed sheets in the future, but at least for now we're good.