If you are serious about the answer to your question. There would be no advantage as a human if this could be done. The Astral,Energy,Emotional,Physical and Mind Body are all connected. The astral body is a twin or double of the physical body but works at a different level.The astral plane is where you visit in your dreams.Time and space are not limiting factors and are less stable,almost fluid like when in the dream state. When we awake from a dream,our astral body slips back into alignment with the physical self. The astral / physical connection is severed when we pass on.