There are four medically defined states of mind. These were named in the order that they were discovered. Each state of mind represents a frequency range within which brain waves are vibrating. In your normal waking state your brain rhythms operate at about 20Hz.
Stress is a result of brain waves operating at a higher frequency.
The higher the frequency the more stressed you become. This is the state of light sleep. When one operates in the alpha state one is at their most efficient. Alpha induces clarity, heightened awareness and intuition. Alpha is a much more efficient state than Beta and using Alpha one can effectively plan your day, meetings, or any stressful event.