Which of the following statements supports the "preservation and protection" hypothesis of sleep?
a. People tend to require more sleep after a hard day of work.
b. Sleep deprivation can lead to impaired cognitive abilities.
c. Jet lag is usually worse when traveling east than it is when traveling west.
d. Many small animals sleep during the day, when they could be easily seen by a predator.
Answer: D
Rationale: Sleep helps preserve energy by lowering metabolism and reducing energy expenditure during times when searching for food is least likely to be productive, and possibly risky.
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