Ilchi Lee expert dahnhak founder writes this in the book of Healing Society.

The purpose of Brain Respiration is to gently move our conscious awareness from our neocortex, where it is most of the time, through the cerebral limbic system and into the brain stem. Ultimately, we seek to control the power of the brain stem to meet with the Creator Within and raise our spiritual awareness.

To control the brain stem, the neocortex needs to be at rest. The neocortex is in a state of rest when we are asleep. However, our awareness is also asleep at the same time, making it impossible for us to consciously control the brain system With a conscious awareness, is it possible for our neocortex to be asleep and for our awareness be awake? Such a state is called “meditation.”