So
@Hip, you are theorizing that our bodies act as a conduit for electromagnetic radiation (coming from adaptors, etc,) if our bodies are grounded?
Yes, my hypothesis is that the effects (both good and bad) which you feel from earthing while asleep in your bed primarily come from tiny electrical currents that run rhythmically in and out of your body via the earth connection, driven by the influence on your body of the mains electric power supply wiring that you have in the floor, walls and ceiling of your bedroom. The rhythm of this current running in and out of your body through the earth connection will be equal to the mains power frequency of 50 or 60 Hz (ie, a rhythm 50 or 60 beats per second).
You can definitely measure a weak alternating current of microamp strength running from your body down the earth connection if you use an electrical multimeter; I did this myself. So there is no question that the current is there, constantly running in and out of your body through the earth connection to your body. And you can see on the multimeter that the earth current increases as you move close to an adaptor plug (because of the oscillating magnetic field that is created by the electrical transformer inside the adaptor plug).
My guess it that your heart beat's natural electrical voltage rhythm will also drive a weak current in and out of your body via the earth connection, but at a much slower rhythm of approximately 1 beat per second (normal heart rate), and at a much, much lower current level (I noted in
this earlier post that the heart beat-driven earth current will be around 1000 times weaker than the mains power-driven earth current).
So I would think that for people inside a building with a mains power supply, this very weak heart beat earth current will be dwarfed by the much stronger effect from the mains electricity. This is why I think that in the home, the biological effects of earthing are likely mostly due to the mains power-driven earth current.
If you were far away from any mains power supply, and were well earthed (eg, bare feet on wet grass), then you would be experiencing a more natural earthing, because under these conditions, it would only be the electrical voltage rhythm of your heart beat that drives an alternating electric current in and out of your body via the earth connection (your wet feet).
Whether this natural earth connection might be better or worse than mains power-driven earthing, in terms of health effects, it is hard to say, because anyone buying a bed earthing sheet is going to primarily experience a mains power-driven earth current, in my analysis. So we don't really have any accounts of the effects of natural heart beat-driven earthing (unless someone who lives in an electricity-free forest hut can give us an account of their experience of earthing).
It would be hard to create a natural heart beat-driven earth connection in the home that was not affected by the mains power (although a Faraday cage completely enclosing your bed would probably work).
As I understand it, the way the main power in the wires in around your house create an electrical voltage in your body is mainly through
capacitive coupling (meaning your body and the mains electric wires around your home automatically create what is known as a
capacitor, which is an electrical system can transit an alternating electric voltage and current across a distance though the air; see
this study). The further your body is from the mains electric wires, the weaker the capacitive coupling becomes, and thus the weaker the influence of the main power on your body (for the tech-savvy, a online capacitance calculator is
here).
But I think you would have to be at a distance of perhaps hundreds of meters from the nearest mains electrical power point or wires in order to make the capacitive coupling so weak that the effects on your body become negligible.