Probably the most important thing to remember about a Reiki session is that any experience is valid. The healing experience is slightly different for each person. Some people feel relaxed, others find that images or past memories are brought up, and some individuals experience intense emotions. Still others feel the actually pulsating, vibration, color, heat, or cold of the energies that are being sent. Moreover, some people only feel the effects of the loving healing energy only during the session while others feel the waves of influence reverberate throughout every part of their lives inviting permanent change.
For even more great posts about Reiki, you may want to check out What is Reiki?, Reiki Basics, The Nature of Reiki Energies, Learning Reiki, and Reiki Best Practices. You can also get a Free Visionary Reiki Session.