Originally published Tuesday, November 25, 2008 at 12:00 AM
Comments (0)
E-mail article
Print view
It's true: Naps are good for you
A study shows naps may boost a sophisticated kind of memory that helps us see the big picture and get creative.
The Associated Press
WASHINGTON — Just in time for the holidays, some medical advice most people will like: Take a nap.
Interrupting sleep seriously disrupts memory-making, compelling new research suggests. But on the flip side, taking a nap may boost a sophisticated kind of memory that helps us see the big picture and get creative.
"Not only do we need to remember to sleep, but most certainly we sleep to remember," is how Dr. William Fishbein, a cognitive neuroscientist at the City University of New York, put it at a meeting of the Society for Neuroscience last week.
Good sleep is a casualty of our 24/7 world. Surveys suggest few adults attain the recommended seven to eight hours a night.
Way too little clearly is dangerous: Sleep deprivation causes not just car crashes but all sorts of other accidents. Over time, a chronic lack of sleep can erode the body in ways that leave us more vulnerable to heart disease, diabetes and other illnesses.
But perhaps more common than insomnia is fragmented sleep — the easy awakening that comes with aging, or, worse, the sleep apnea that afflicts millions, who quit breathing for 30 seconds or so over and over throughout the night.
Indeed, scientists increasingly are focusing less on sleep duration and more on the quality of sleep, what's called sleep intensity, in studying how sleep helps the brain process memories so they stick. Particularly important is "slow-wave sleep," a period of very deep sleep that comes earlier than better-known REM sleep, or dreaming time.
Fishbein suspected a more active role for the slow-wave sleep that can emerge even in a power nap. Maybe our brains keep working during that time to solve problems and come up with new ideas. So he and graduate student Hiuyan Lau devised a simple test: documenting relational memory, where the brain puts together separately learned facts in new ways.
First, they taught 20 English-speaking college students lists of Chinese words spelled with two characters — such as sister, mother, maid. Then half the students took a nap, being monitored to be sure they didn't move from slow-wave sleep into the REM stage.
Upon awakening, they took a multiple-choice test of Chinese words they'd never seen before. The nappers did much better at automatically learning that the first of the two-pair characters in the words they'd memorized earlier always meant the same thing — female, for example. So they also were more likely than non-nappers to choose that a new word containing that character meant "princess" and not "ape."
"The nap group has essentially teased out what's going on," Fishbein concludes.
These students took a 90-minute nap, quite a luxury for most adults. But even a 12-minute nap can boost some forms of memory, adds Dr. Robert Stickgold of Harvard Medical School.
![]()
Conversely, Wisconsin researchers briefly interrupted nighttime slow-wave sleep by playing a beep — just loudly enough to disturb sleep but not awaken — and found those people couldn't remember a task they'd learned the day before as well as people whose slow-wave sleep wasn't disrupted.
None of the new work is enough, yet, to pinpoint the minimum sleep needed for optimal memory. What's needed may vary considerably from person to person.
But altogether, the findings do suggest some practical advice: Get apnea treated. Avoid what Harvard's Stickgold calls "sleep bulimia," super-late nights followed by sleep-in weekends. And don't feel guilty for napping.
Copyright © 2008 The Seattle Times Company
E-mail article
Print view Share:
Digg
Newsvine
WHO: AIDS leading cause of death, disease in women
For 80-year-old Maple Valley man, hoops aren't just a dream
Should kids be forced into extracurricular activities?
Can't find the hot new toy? Blame the economy
Lawmaker wants probe of E. coli and school lunches

Ken Auletta talks about "Googled"
Ken Auletta talks about Google with Brier Dudley at the Seattle Central Library.
nwjobs

Post a comment

Michelle Goodman blogs about work/life balance.
How to tell your office you're gravely ill
Post a comment
nwautos

Choosing a new sedan? Weigh the impact of your choice on your wallet and on the planet.
Post a comment
- 'Missing' SeaTac man found with new name, in new state
- Bombs, guns found at home of suspect in Officer Brenton's slaying
- Police: DNA from officer's slaying matches suspect
- How an underdog named Mike McGinn took City Hall
- 3 Cascade Mountain passes close due to snow; more rain, wind expected Sunday
- Prosecutors consider charges against suspect in police shooting
- Three more fires ignite in Greenwood
- Steve Kelley | Hasselbeck gives Seahawks' sagging season a stay of execution
- The birth of 'Grunge,' in photos by Michael Lavine
- Teenage serial burglar suspected in more Camano Island burglaries
- Prosecutors prepare charges against suspect in police shooting
250 - House health bill unacceptable to many in Senate
246 - Pelosi tours Seattle's Swedish after health-care vote
164 - Prosecutors prepare charges against suspect in police shooting
139 - Alleged shooter tied to mosque of 9/11 hijackers
135 - Obama puts heat on Senate to speed health bill
123 - Resolute Fort Hood soldiers ready for return
116 - McGinn more than doubles his lead over Mallahan
95 - Ayn Rand: goddess of the market, gateway to the American right
79 - Cutaia says replay handled properly on Austin TD
68
- For 80-year-old Maple Valley man, hoops aren't just a dream
- Plans call for Triangle to become West Seattle gateway
- Three more fires ignite in Greenwood
- 10 ways to take control of your health
- The birth of 'Grunge,' in photos by Michael Lavine
- 'Missing' SeaTac man found with new name, in new state
- Bombs, guns found at home of suspect in Officer Brenton's slaying
- Taste | Ruth Reichl still reigns as queen of America's culinary scene
- Silver Lake restaurant destroyed by fire
- Pakistani-American cafe, bar owner on verge of being Granite Falls mayor





