When Gardner finally went to bed, he slept for 14 hours and 45 minutes. The second day he slept for twelve hours, the third night he slept for ten and one-half hours, and by the fourth night, he had returned to his normal sleep schedule.
Even though Gardner recovered quickly, scientists believe that going without sleep can be dangerous. They say that people should not repeat Randys experiment. Tests on white rats have shown how serious sleeplessness can be. After a few weeks without sleep, the rats started losing their fur(皮毛). And even though the rats ate more food than usual, they lost weight. Eventually the rats died.
During your lifetime, you will probably spend 25 years or more sleeping. But why? What is the purpose of sleep? Surprisingly, scientists dont know for sure. Some scientists think we sleep in order to replenish(补充)brain cells. Other scientists think that sleep helps the body to grow and to relieve stress. Whatever the reason, we know that it is important to get enough sleep.
16. Randy Gardner studied the effects of over over-sleeping.
A Right B Wrong C Not Mentioned
17. During the experiment, Gardner slept for two hours every night.
A Right B Wrong C Not Mentioned
18. During the experiment, Gardner had trouble speaking clearly.
A Right B Wrong C Not Mentioned
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