Unfortunately, not everyone is a believer in everything, even if it is catagorically true without question. There are millions of people out there that still believe the Earth is flat.
There are people that don't believe processed foods cause Cancer as thats all their family eats and no one has ever had Cancer. On the flip side there are thousands of people out there who have cured Cancer, literally reversed it completely, by fasting; by eating nothing until the digestive system shuts down and moves into the Autophagy stage and eats all the bad cells in the body. This has also been backed by science and proven thousands of times for decades, but still remains a pseudoscience currently with many debunkers.
Very respected and decorated scientists have stood up infront of thousands of other scientists and have scientifically backed grounding sheets. Why would they do this unless this is a credible therapy?
All 'proven' Science today was psuedoscience once upon a time. Who is correct? Those who explain grounding sheets using science based explanations, or those who debunk? Debunkers themselves have debunked every single scientific breakthrough society now accepts as absolute truth. Should bacon be eaten with tomato sauce or brown? Should tomato sauce be kept in the fridge or cupboard? Do we love marmite? Do we hate marmite? Who knows and each to their own I suppose!
Aromatherapy does nothing for many, but eases the pain and suffering and enhances the well being of countless others. Same with meditation and mindfulness. Science to some, pseudo to others.
Having suffered from some ailments in recent years I have looked into grounding sheets and have used them for the past month or so. I have seen instant results. As has my wife. She immediately began having deep sleeps and waking up clear headed from her very first uses of the sheet, whereas usually she has broken interrupted sleep due to perimenopause and often wakes up with headaches. These symptoms disappeared overnight with the introduction of a grounding sheet. I myself have noticed a measured reduction in blood pressure (I test it daily) and I do wake up more refreshed and clear headed. I still think "this is crazy" but the evidence is there for us and our bodies.
Other people may not be wired the same way, and may report no results. Our logic was if they don't work, we still have a comfortable bed sheet. If they do work, it is a Brucey Bonus! So it is not a waste of money of you buy one. Illnesses in tribes that do not wear shoes and who are literally in touch with the earth are significantly less than the rest of the planet. Obviously, there are many factors, but grouding is considered a major factor with some scientists.
What can't be denied though, is that our bodies build up an electrical charge which in some people leads to illness. When you connect to the ground and ground yourself, you do receive free electrons from the earth and your body's electrical charge reduces. You can prove this with an electricians multi meter. You can read the electrical charge your body is giving off and you can touch a good quality grounding sheet and show the immediate reduction in electrical charge. Something scientifcally tangible is happening for sure, I suppose it is the outcome it leads to that people ultimately question.
At the end of the day if you believe in grounding, you have nothing to lose by buying a full sheet that covers a whole bed. It is a bed sheet after all. We were sceptical and dived in and now we have proof to ourselves it works. It is a thing!
Good luck OP and apologies for my ramblings, I appreciate I went off on a few tangents.