Listen to a free sample! Aerin Alexander guides you to calm your mind, relax your body and fall asleep! Through small, slow, gentle bodily movements of your hands, eyes, shoulders Aerin guides you to initiate and enhance the inhibitory process of your nervous system, at will. The result is natural, restful sleep whenever you need it. Learn the sleep-inducing techniques of the Sounder Sleep System with this step-by-step audio.