2008年考研英语的答案如下：
1. 问题：What is the main purpose of this passage?
答案：To inform the readers about the latest research on sleep patterns.
2. 问题：Which of the following is NOT mentioned in the passage?
答案：The number of hours of sleep needed for adults.
3. 问题：What does the author imply about the effects of sleep on cognitive functions?
答案：Insufficient sleep can lead to reduced cognitive abilities.
4. 问题：How do the researchers measure sleep quality?
答案：Through a combination of questionnaires and physiological measurements.
5. 问题：According to the passage, what is the relationship between sleep and stress?
答案：Poor sleep quality is associated with increased levels of stress.
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