A lot of people, myself included, notice clear effects of earthing the body while asleep in bed. However, it is very common for the beneficial effects to reverse after a few nights earthing, and then earthing starts to make you feel worse. I have seen this reversal of benefits reported many times. It's a mystery why that happens.
So it will be interesting to see if you can maintain the HRV effects in long term.
When I tried earthing, the first night I slept so profoundly, I slept like a baby. And I felt refreshed when waking. I thought I had discovered the secret to a good night's sleep. The second night I also slept nicely, but not as good as the first night.
But on the third night of earthing, I slept terribly: agitated, tossing and turning in bed, and I kept waking up all night long.
The fourth and all subsequent nights were like that: very agitated sleep where I kept waking up. The nights actually became almost torturous, my sleep became that bad!
I was unable to reproduce the wonderful sleep I had on the first night.
The effects of earthing also seem location and house dependent: one person in
this thread reported earthing put their POTS and dysautonomia into remission; but later when she moved house, she found she could not longer get these benefits from earthing.
Generally, the literature on earthing is a little dubious. People talk about the benefits of electrons, but as
@Wishful pointed out, this is not really a scientific explanation, as the body is usually electrically neutral anyway (unless you are walking with rubber soles on nylon carpet, in which case the body can pick up a static electric charge).
I don't believe anyone has properly looked into why earthing has effects on the body, but I summarized some studies in
this post.
My own theory is that connecting the body to the earth allows the main electricity 50/60 Hz hum to drive a small current in and out of your body at 50 or 60 times per second (as you mentioned earlier). I detail that theory in
this post.
When I was earthed, I was able to measure this small current on a digital multimeter, it showed a 0.2 μA of alternating current was running between me and earth, when I was indoors.
And when I moved my body or limbs to within 30 cm or less of a power adaptor plug (power adaptors contain a transformer that creates an oscillating magnetic field in proximity of the adaptor), I found that the current flowing to earth from by body went up to around 1 μA. See
this post.
So in effect, I think earthing might be a form of microcurrent therapy.
To test this theory, one could try sleeping with the mains electricity turned off in the house, and then observing whether you get the same benefits.