How is this possible?

[Daredevilpwn]

I know that there is no difference in brain activity when you imagine an event or are experiencing an event. Say for instance I look at a glass bottle and then imagine a glass bottle. The brain activity in both instances would be the same. But we both know that one cup is in waking life while the other is visualized in our minds. In the lucid dream state we are supposed to be in our own mind. Now if I look at a glass bottle in my lucid dream state, this bottle is by all means in my mind since it's in my dream which is also in my mind. But if I visualize myself looking at a glass bottle while in the dream state and not actually looking at the bottle in the dream state then this is also occurring in my mind right? So how is it possible for us to have a separate imagination in our heads while in a dream scape that is already in our heads in the first place? If our dreamscape is in our heads then where are visualized images stored before we actually manifest them into the actual dreamscape? They are in our heads yes but they are not in the dreamscape so are they somewhere else lying outside of the mind? Is there a seperate part in our mind where dreams are created and imagined images are created?That is my question.