An "alpha state of mind" is what scientists associate with "right brain" activity, or our subjective senses of imagination, creativity, memory, and intuition. 

When your brain wave activity slows down to between 7 and 14 HZ, you are said to be in an Alpha state. It is considered a "relaxed" state of mind that allows you to be more receptive, open, creative, and less critical. Edison, Einstein, and many other brilliant thinkers considered a daily ritual of accessing an alpha state of mind essential to their work.  Use this 38min program to ease yourself into this relaxed, creative state.