On its own, earthing is also relaxing. Also, earthing typically improves sleep; and increases one’s resilience against physical stresses.
Read more about earthing at The Bulletproof Executive:
Earthing products involve either a grounding rod or plugging a wire into the ground/neutral terminal of an electric outlet and connecting that in some way to your body. This might sound dangerous — no doubt it could be, in a thunderstorm. I don’t supply a special earthing gizmo for The Whole Body Vibrator. All you need is a wire. What I use is the “Plug to Gator” at the link below: