Afternoon Nap Might Make You Smarter

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"The brain's ability to soak up information is not always stable," Walker said. "It seems as though the brain's capacity may be a little like a sponge. It may get waterlogged with continued learning throughout the day."

Jessica Payne, an assistant professor at the University of Notre Dame, said the study findings "really add to something we already know about why sleep is important."

One message from the research, she said, is that sleep can be valuable for "students and for people who are struggling with their memory because they're aging."

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Other recent research has suggested that sleep can help you think more creatively, have better long-term memory and preserve important memories.

The study findings were scheduled to be presented Sunday at the annual meeting of the American Association of the Advancement of Science in San Diego.

More information

The National Sleep Foundation has details about sleep.

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