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A device to "sleep on it" could be well founded, scientists say. After a good night’s sleep, a problem that seemed insurmountable(不能克服的) the night before can often appear more{{U}} (47) {{/U}}, although the evidence until now has been anecdotal(轶事的，趣闻的). But{{U}} (48) {{/U}}at the University of Luebek in Germany have designed an experiment that shows a good night’s sleep can{{U}} (49) {{/U}}insight and problem-solving. Dr. Jan Born, a neuroscientist at the university, and his team taught volunteers two simple rules to help them{{U}} (50) {{/U}}a string of numbers into a new order. There was also a third, {{U}} (51) {{/U}}rule, which could help them increase their speed in solving the problem. The researchers divided the volunteers into two groups, half were allowed to sleep after the training while the{{U}} (52) {{/U}}were forced to stay awake. They noticed that the group that had slept after the training were twice as{{U}} (53) {

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