This has the potential to be a fascinating topic. In your research attempt to explain the purpose of sleep. Also discuss what is known about the stages. You may also include research on sleep disorders. Do not include any information on dream interpretation.
UCLA's reference page on sleep: Links to an enormous number of related sites on sleep. Excellent start point. Do not "copy" the syllabus on sleep! *****
Sleep Quest: Site devoted to sleep disorders. More medically related than pure science.
Web MD: Medical site related to sleeping. Has links to excellent articles on sleep.
About.Com: A search engine with an abundance of sleep related sites.
National Sleep Foundation:The authorities on sleeping.
Behavioral and Mental Disorders. Scroll down until you see Sleep Disorders. *****