One senses everything with the mind, but where is the self when one sleeps?

One touches the wall, it is not the wall giving the sense, but oneself giving the sense and returning to the mind. If there are two objectives, the self cannot exist in the mind, but in the sense. The sense of touching the wall, which comes from the wall but not the wall itself.

There assume, there is something contained in the wall to trigger the sensation, which here we can identify as self.

Every sense of the world is the feedback of self. Experience a part of self when a thing happens. A drop of water exists everywhere but also contains the whole sea of the ocean.