Here is the example of summarization of why do we dream.
Why do we dream?
There are two major causes of why we dream. Firstly, we dream because our brain is still working while we sleep at the REM (Rapid Eye Movement) stage of sleeping. This made we dream 5 to 20 minutes or 3-7 times a night. When we dream sometime we are still able to control ourselves, this causes of Lucid dreaming- the dream that you are aware of and control the roles in the dream. Secondly, some scientists stated we dream because of unconscious thought. Our own thoughts, desires, and motivation are the causes of our dream.