The conscious waking state of the mind operates between 14 to 28 cycles per second. This is the normal thinking and thought awareness state in everyday life. Did you know, when people consume coffee in the morning, they are jump starting the beta waves from the alpha state (sleeping).
Alpha brainwaves occur when you are in a very relaxed meditative state from 7 to 14 cycles per second. The alpha state, is the bridge between the conscious and the subconsious. Creative inspiration, insight, reduced stress and dreams are characterized by alpha. Some alternative therapies operate in the alpha brain wave state.
Theta Brain waves range from 4 to 7 cycles per second. Theta brainwaves are initimate with the subconscious. The subconscious holds secrets, past issues and memories that are invisible to the conscious mind. Hence the name "Theta" Healing, or subconscious healing.
From 0 to 4 cycles per second are delta brain waves. When you are in a deep dreamless sleep, you are in Delta. During that deep dreamless sleep, the unconscious mind becomes unaware of the physical world. Have you wonder why there are sleeping agents in cold remedies ? In this state is where the healing and regeneration occurs.