How do you think is it possible for a dreaming person to scare or surprise themselves in a dream if the source and observer of the dream are both taking place in the subconscious mind?
To me this indicates that their are at least two independent parts of the subconscious mind. If we count the conscious mind, we have at least three parts of the mind at this point.
What does this lead you to believe about consciousness?
If one part of the subconscious mind acts like a TV receiver and another part acts as an observer of what appears on the screen as content of a dream, there could be another deeper level of subconscious that transmits the dream. Either that or the source of the dream is outside of the mind, like the content of a TV is outside of the TV.