When I am reading a book, or watching a film, I become engrossed. If it is well written, I become the person to such a degree that I am no longer just experiencing the story, I'm living it. It gets to a point where I sometimes have to consciously separate it from reality.
Sometimes I will have dreams that wouldn't look out of place in reality. While I am still in the dream I will find myself considering the repercussions of my dream persona's actions; mapping a path out of the mess that I have created. I cannot tell you how relieved I am when I wake up and realise it was just a dream. I think I have always been like this. When I was about four years old, I first questioned whether I truly existed. Did I have any effect on the world around me? I then hatched a devious plan to test this by cutting holes in the skirting of my bed. My mom soon proved to me that I did.
I now believe that everyone impacts the world even if that impact is not immediately apparent. Your world is ruled by your perceptions and interpretations. You have the ability to be happy, angry, start wars, make friends, do nothing. Not everything is measurable but you will know from your internal barometer whether you have made a difference. Change is realised internally before it is ever perceived externally. The mere notion of questioning whether you have an impact on the world is enough to do just that. Every great person has started with a dream that they have chosen to share with reality. So pay attention to your dreams as it might just hold the key to ruling your world.