Whenever i listened to this one, for some reason, i fell in AP quickly or a deep sleep. I hear it is because of the tones, changes in depth or? not sure, but watch how you react, and it helps you easily move from one state to another - https://www.youtube.com/watch?v=tZrBRQn6K0A&feature=BFa&list=PL6E758EE93C9DB841