First, some information on how the brain works and details on different brain states.
- Beta - oscillates at speed of 14-30 wave cycles per second; this is a state of complete alertness. It is characterized by high concentration, "one-track" thoughts, and higher cognition.
- Alpha - oscillates at a speed of 8-13 wave cycles per second; this is a state of relaxation but it actually gives you a higher level of awareness. Because of this, the alpha state helps users reduce stress, visualize ideas, and find creative solutions to problems.
- Theta - oscillates at a speed of 4-7 wave cycles per second; this is the deepest level of relaxation that you can achieve without physically sleeping where you still retain a level of consciousness. It is characterized by feelings of "floating" and is considered the best state for meditation, learning/memory retention, and behavior modification.
- Delta - oscillates at a speed of less than 4 cycles per second; this is the deepest level of relaxation that occurs naturally when you reach a level of deep sleep where all conscious awareness is gone and dreams occur. It is characterized by dreaming and detached awareness and can be used for healing the body and mind and/or regeneration (which is why sleep gives you energy).