Filed Under:

'Memory Pinball' And Other Reasons You Need A Nap

Play associated audio

We spend about one-third of our lives sleeping, but much of that function remains a mystery. Weekend Edition Sunday is asking some pretty fundamental, yet complicated, questions about why we do it and why we can't seem to get more of it.

Dr. Matthew Walker says the question of why we sleep remains "that archetypal mystery."

Walker, the principal investigator at the sleep lab the University of California, Berkeley, works with patients who suffer from sleep abnormalities. He says the complexity of sleep makes the research that much more fascinating.

"There have been so many great discoveries within science based on the revolution of sort of genetics and molecular biology, and sleep remains resistant to all of that in terms of an answer," he tells Weekend Edition host Rachel Martin.

Walker says there have been several critical discoveries, however, illuminating how sleep helps us learn and retain information. Researchers are also taking note of the negative side effects of not getting enough sleep.

Research on learning suggests "sleep is critical at almost all stages of memory formation, memory processing and long-term memory retention," he says.

Science also backs up historical anecdotes about how sleep fosters creativity.

"There seems to be some type of memory processing that's creative that starts to take pieces of information that we've learned recently and starts trying to test the connections between that recent information and all of the information you've got stored in your brain," he says. "So it's almost like memory pinball — you're bouncing that information around, you're testing which connections to build."

So what happens if you don't sleep? "A whole constellation of different brain and body functions start to deteriorate," he says. Our brains are less effective at absorbing new information without sleep. Plus, our ability to retain recently learned information is impaired, and "you lose the chance to essentially hit the save button on that information."

Aside from memorization, sleep deprivation makes it harder for the brain to regulate emotions.

From an evolutionary perspective, sleep doesn't seem like a good idea: survival instincts are on hold. But Walker says the fact that sleep has stuck around so long shows its biological importance.

"Sleep serves so many wonderful, beneficial functions that far outweigh those potential downsides to it," he says.

Copyright 2013 NPR. To see more, visit http://www.npr.org/.

NPR

Not My Job: NASA's Charles Bolden Gets Quizzed On 'Charles In Charge'

NASA Administrator Charles Bolden flew four times on the space shuttle and was the first voice to be broadcast from Mars. We'll ask him three questions about the remarkable career of actor Scott Baio.
NPR

Scraped, Splattered — But Silent No More. Finally, The Dinner Plate Gets Its Say

Instagram is the Internet's semi-obsessive, borderline-creepy love letter to food. But behind every great meal is a plate doing a pretty-OK job. So a comedian made an Instagram to celebrate plates.
NPR

RECAP: A Round-Up Of Can't-Miss Stories From The RNC

Here are some stories from the NPR Politics team to catch you up on the news from the Republican National Convention in Cleveland this week.
NPR

Making The Cloud Green: Tech Firms Push For Renewable Energy Sources

Few people can demand what kind of electricity they get. But Microsoft and Facebook, which operate huge, power-hungry data centers, are trying to green up the electricity grid with their buying power.

Leave a Comment

Help keep the conversation civil. Please refer to our Terms of Use and Code of Conduct before posting your comments.