When You Are in Deep Sleep, What Does It Mean?

When you are in deep sleep, what does it mean? It means that you are not aware of your physical body. Even when you are dreaming, your physical body is lying on the bed,. Only when you are awake is the physical body part of your experience. And finally, from manju, who wants to know, my mind is shut dow, who is looking after my body? By whose controlled bodily functions such as heartbeat, breathing, digestion, et cetera, happen? What is the ground of existence of my body and the world? Where does it exist? How am i able to come back to my body only, or not to any other body? Right?