Sleep Sound evokes, within me, ideas around my personal evolution (and perhaps maturation), meaning that I get a deeper sense of what life's experience and thoughtful introspection all along the way can mean in the manifestation of purpose. Many of us want to inherently know we are not wasting our lives doing something that has no meaning.
I hate using the word "purpose" because, well, it has been overused. Some people use "calling," but that always feels like something from the spiritual realm. From a scientific perspective, purpose can never be confirmed, therefore, it may not even exist in the sphere of universal, evident truth. Instead, one might argue that choosing a purpose and moving towards it ultimately creates the potential for manifesting thoughts into results, that is strong enough to create the reality.