The question wants to analyze your writing skill. In that case, I can't write your essay, but I'll show you how to write it.
As the question shows you will have to research the purpose of dreams. This research should be done on articles written by experts and people who have the authority to speak on the subject.
During the research, you will keep important information that must be present in your essay.
More information on how to write an essay at the link:
https://brainly.com/question/8407102