Observe the energy move through your whole body. Wait and see if it speeds up or slows down. Express gratitude for the conscious experience of the energy. The fact that you are perceiving this energy is indicative that you are reaching an expanded state of consciousness. Also, I cannot remain on my back very long without getting restless.
Some people report that they prefer sitting up because they're less likely to drop off to sleep.
Ear-buds are readily available at stores carrying stereo products. Even while in Focus 10, I am aware of my breathing. This makes it impossible for me to detach myself or otherwise perceive the high-energy states. Actually, it can enhance your experience if used in a positive way. Be aware of what is happening to you and just let it be - don't fight it.