In between Sleep and Dream

What is there in between sleep an dream? Nothing..?? Something??? There is nowhere nothing is available. Nowhere is empty. Everywhere is filled with something. No vacuum. Sleep can continue until dreaming. But dreaming cannot occur without sleep. Nobody can dream in waking state. But when we are dreaming we are not sleeping. Our consciousness is alert. Mind is thinking. Soul is aware of what is happening inner world. Soul is the creator of the dreams. But how can mind switch from sleep to dreaming. Sleep come from body. It is a physical state. Dreams come from unconscious. It is a metaphysical state. How these states are interconnected?What is the bridge between these two? Mind is the media to send souls impulses to the body. In soul's control body cannot resist anymore. It has to give away from sleep and let the mind to enter into soul. Mind is the messenger. Can we create our own dreams? No...! Until we realize the messenger we can't do it.