People spend about one-third of their lives asleep. It seems certain, therefore, that sleep has a ____ function. However, what that function might be is still in____. Scientists are far from being in agreement about____ why so much of our precious time is given over to sleep. There seem to be three main theories. The most popular states that the functions and ____ of sleep are primarily physiological. It claims that we sleep in order to ____ the health of our body. In other words, biological processes work hard as we sleep to repair any damage done during the day and to restore ourselves to ____ efficiency. However, a second theory places more emphasis on the learning benefits of sleep. This theory holds that sleep allows us to process the information that we ____ during the day, and asserts that, without sleep, learning would not take place. A third popular theory is ____ on ideas about energy, saying that we need ... of sleep in order to, in a sense, recharge our batteries and so have an adequate supply of energy for the coming day. A third popular theory is based on ideas about energy, saying that we need ____ of sleep in order to, in a sense, recharge our batteries and so have an adequate supply of energy for the coming day.

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