Mediation is very important and effectively for human.You practice Yoga Nidra while lying prone and follow the spoken instructions of a teacher. It is, of course, convenient to use the Yoga Nidra tape, or record one yourself. In the first phase of the session, you progressively relax your muscles by quickly running attention through different parts of the body. This is followed by an awakening of sensations of pairs of polar opposites, such as heaviness and lightness. The last phase is a rapid visualization of some nature images and abstract symbols. http://www.hipfourms.com/newforums/showthread.php