Nagualism is an ancient tradition of teachings that can be found amongst Native Americans, particularly from Mexico. The Nagualist tradition has a significant amount of focus on dreaming, particularly lucid dreaming. For a deeper dive from someone who was raised in this tradition, I would recommend looking into the work of Sergio Magana aka Ocelotocoyotl.
Qigong has been referred to as "the medicineless hospital". It is very meditative. It's very much about belief, faith, and intention. Where your focus goes is where the qi flows. If you are in the right state of mind, focusing positive attention upon some area of your body can heal it.
Think of Qigong as the study and application of the Placebo Effect.
