Why do people sleep and dream?

Why do people sleep and dream? What are the most recent scientific theories to explain why people sleep and dream? Do any of these theories seem convincing to you?Please note that all papers published in anthropology and psychology use the following format for references
The Anem tribe in Papua New Guinea, does not allow cousin marriage (Smith, 1989:46).
The authors last name is given first, the date of the publication, and the page number. Then in your reference you would list Smith, Jane The Anthropology of Food Use, Doodle Press, Toronto, 1989.
Every essay begins with an abstract summarizing the entire essay.
There is an introductory paragraph setting forth your thesis.
The body of the essay should attempt to prove your thesis and counter objections to it in a logical sequence or manner.
The final paragraph should sum up your thesis.
This is followed by the list of references. Any photos, charts, diagrams, graphs, or statistics are added as an appendix after the references.
This is for my Grade 11 Social Science (anthropology,Sociology and psycology) Summative

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