Everyone responds differently to subtle energy sessions.  We have experienced clients who get tired during a session, some feel very energized and some do not feel anything.  We have received feedback from clients that they felt fine during the session but once they got home, they felt like they wanted to nap. This can happen because the frequencies given to your energy field during the session is continuing to resonate in your field.  Your body is using this new information and is integrating the session.  This is the time when the body is trying to bring itself back into balance.