Read the text below. For questions choose the correct answer.
A recent study may have an answer to one of mysteries in science — what is the purpose of sleep? The work it’s actually about making animals function more efficiently in their environments.
Pythons and bats are among the longest sleepers at over 18 hours a day. Human babies need 16 hours, and most of us probably feel we need around eight hours of sleep well.
Professor Jerry Seigel from the University of California, Los Angeles, conducted a study of the sleep times of animals and found that they vary widely. Some, like migrating birds, can survive long periods without sleeping at all. He believes that sleep helps to conserve and to make best use of limited resources. Sleeping also makes us less likely to .
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