There were several of us getting attuned at once and we were sitting in chairs side by side. My stomach kept growling and rumbling and I really hoped no one could hear it. Then I heard those around me doing the same thing. We had just eaten lunch, so it wasn't that we were hungry. Something about it made me want to start giggling, but, thank goodness, I held it in.
I've since noticed that whenever I receive energy work my stomach does this. It must be a common side effect. :)