There is no undressing in these modalities. The changes come from deep within the body systems and ripple out adjustments to the external tissue and bone, so undressing is not necessary.
I am usually pretty quiet when I work due to a necessary precision in focus in order to listen and move bones, tissue, and energy. I am evaluating what the body wants to do next, and am encouraging it along the way.
Most people get very relaxed during a session and there is a tendency to fall asleep while the body is resetting. I will often ask the person to stand up to walk about half way through to see how things have changed and what feels different during gravity and movement. I do like to work about 90 minutes.