Some interesting news and research ...
There's been a lot of recent interest in the vagus nerve. The vagus nerve, Latin for 'wandering', also called the '10th cranial nerve', is the longest, largest, and most complex of the cranial nerves. Experts have linked its activity to symptom changes in people with many common ailments. The vagus nerve’s activation or deactivation is tied to the ebb or flow of hormones such as cortisol and the digestive hormone ghrelin, the amount of inflammation the immune system produces, and many other processes. Heightened vagal activity slows heart rate and also switches off inflammation. There’s also evidence that activating the vagus nerve through electronic stimulation can produce a range of health benefits. Almost anything people find relaxing — meditation, deep breathing — is associated with heightened vagal activity and parasympathetic nervous system activity. Things like doing yoga or deep-breathing meditation activate the vagal nerve.