These brainwave patterns are typically grouped into four different categories: Beta, Alpha, Theta and Delta. Each of these brainwave patterns is associated with various states of mind. Relaxation, meditation, learning, peak performance, stress reduction and deeper sleep are some of the reasons why people worldwide are using Mind Machines. There are many choices of Light & Sound Mind Machines available ... from the Proteus,Nova Pro 100,David Delight from Mind Alive and many more. Have a look below!