Researchers at the University of Tubingen conducted a study in which 191 adults performed memory tasks like memorizing word-pairs. Half the group was then told it would be re-tested on that task 9 hours later, while the other half was told to expect a different task, NewScientist.com reported Tuesday.

During the 9-hour interval, some members of each group were allowed to sleep.

Those who slept expecting a re-test of their task recalled 12 percent more word pairs than those sleepers who had no expectation of being tested again on the same information, researchers found. They had more slow-wave sleep, known to be linked to memory consolidation.

Those subjects told to expect a re-test but not allowed to sleep did not perform as well, researches said.

The results improve our understanding of sleep, researcher Jan Born says.

"There is an active memory process during sleep that selects certain memories and puts them in long-term storage," Born says.

The study is "very convincing," Penny Lewis, who studies memory and sleep at the University of Manchester in the United Kingdom says.

"It looks like if you tell someone something is important, it gets enhanced more," Lewis says.

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