In the recent study, participants were shown groups of three words --- such as “cookie”, “heart”, and “sixteen”----and asked to find another word that can be associated with all three words. They were tested once in the morning and then given the same task again in the afternoon. In between, some were allowed a nap with REM sleep, some a nap without REM sleep, while the others had a quiet rest period. The quiet rest and non-REM sleep groups didn't improve, but the REM sleep group improved on their morning performance by an average of almost 40 per cent.

　　Dr Sara Mednick, a sleep researcher at the University of California who led the study, believes the formation of connections between previously unassociated information in the brain occurs during REM sleep. People woken while their closed eyes made rapid movements recalled much more colorful and detailed dreams than people woken during other stages of sleep.

　　1. According to the passage, to have a good memory, a person had better _______ at night.

　　A. sleep four to five hours at most

　　B. sleep as much as possible

　　C. sleep with four or five periods of REM

　　D. have a shallow sleep

　　答案解析：答案为C。本题为细节题。由第二段 “An average night's rest includes four or five spells of REM sleep…

　　This means adults getting less than the recommended seven to eight hours a night -- and therefore inadequate REM sleep -- may be damaging their mind's ability to memorize:”可知，REM 睡眠包括四个或者五个阶段，如果成年人睡眠少于七到八个小时，会伤害大脑的记忆力，故答案为C。

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