There are studies in this regard, like Can electrons act as antioxidants?,
The most reasonable hypothesis to
explain the beneficial effects of
earthing is that a direct earth
connection enables both diurnal
electrical rhythms and free electrons
to flow from the earth to the body. It
is proposed that the earth’s diurnal
electrical rhythms set the biological
clocks for hormones that regulate
sleep and activity. It is also
suggested that free electrons from the
earth neutralize the positively
charged free radicals that are the
hallmark of chronic inflammation.
It is possible that the benefits of
many bodywork, energetic and movement
therapies, as well as of various
energy medicine devices, are partly
due to their ability to enable mobile
electrons to penetrate into the
inflammatory pockets where they
neutralize the free radicals that
contribute to so many different
or this study that looks at "the biologic effects of grounding the human body during sleep"
Measurable improvements in diurnal
cortisol profiles were observed, with
cortisol levels significantly reduced
during night-time sleep [...]
Subjectively reported symptoms, including sleep dysfunction, pain, and stress, were reduced or eliminated in nearly all subjects.
Results indicate that grounding the
human body to earth ("earthing")
during sleep reduces night-time levels
of cortisol and resynchronizes
cortisol hormone secretion more in
alignment with the natural 24-hour
circadian rhythm profile.
However, seeing people making money by selling "Earthing Products" does tickle my spidey sense...