In up to 30% of people with chronic insomnia no cause can be identified. Medical treatment of these people has generally been with sleeping pills. It is estimated that 25% of the adult population in America took some type of medicines for sleep last year. It is generally agreed that sleeping pills should only be in the lowest dose and for the shortest possible time.

　　Sleep hygiene is directed at changing bad sleep habits. The recommendations are: Go to bed only when sleepy. Do not wait up to a specialized time. Avoid caffeine and alcohol in the evening, etc.

　　1. The word insomnia means

　　A. having trouble falling asleep.

　　B. feeling that sleep is enough.

　　C. having no sweats at night.

　　D. having normal sleep pattern.

　　2. How many possible causes of sleeplessness are mentioned in the second paragraph?

　　A. Five. B. Six. C. Seven. D. Numerous.

　　3. The expression Second on the list in the second paragraph means

　　A. the second least important cause of all kinds of sleeplessness.

　　B. the second most important cause of sleeplessness.

　　C. the second on the doctors list about sleepless people.

　　D. the second on the writers list recording sleeplessness.

　　4. Concerning the use of sleeping pills, which of the following statements is true?

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