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Sleeper Effects: Slumber may fortify memory, stir insight

There's nothing like a good night's sleep to get some serious thinking done. That, at least, is the theme of two new investigations, one conducted with rodents and the other with people.

Rats permitted to explore novel objects display distinctive activity throughout much of their brains. That activity reappears—even more strongly than originally—during a stage of slumber called slow-wave sleep, say neuroscientist Sidarta Ribeiro of Duke University Medical Center in Durham, N.C., and his colleagues.

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