I have to write an essay on "Reality is all in your head" using three different things out of three chapters in the book. I am thinking about using dreams(are they real or just in your head), hallucinogenic drugs( how they alter perceptions), and detecting pain ( does it really hurt or is it in your head -why some people hurt worse than others). I don't even know where to start. I need a paragraph for each one. Can anyone help me?