Hi,
The main difference between lying down compared to sitting up is your less inclined to go unconscious. Plus the energy apparently moves through the body easier as well. I believe its more to do with traditional meditation techniques however. Bill has said h/s is compatible with lying down and even while you sleep.
I lie down or otherwise sit in a recliner. Lying down has been more practical as there are other people still awake in the house when I'm doing my session, so its off to my bedroom. Its unusual that I fall to sleep but occasionally do go unconscious.
good luck
