You know Gary, I read about the restless leg syndrome where you feel all sorts of sensations in the leg like IBS'ers feell in their viscera. Well after reading that , when I went to sleep, I found my mind auttomatically focused on my leg and I found all sorts of uncomfortable sensations in my leg. I was so afraid that I would feel all the sensations in the minutest detail. Then I decided to focus on breathing i.e on the nose and immediately I lost consxiousness of all the sensations. So that is yoga in action for you. I bet IBS'ers could focus on breathing exercises and lose visceral hypersensitivity.