Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

’Sleep debts’ accrue when nightly sleep totals six hours or fewer

14.03.2003


Penn study find people respond poorly, while feeling only ’slightly’ tired

Sleep: Don’t be too sure you’re getting enough of it.

Those who believe they can function well on six or fewer hours of sleep every night may be accumulating a "sleep debt" that cuts into their normal cognitive abilities, according to research conducted at the University of Pennsylvania School of Medicine. What’s more, the research indicates, those people may be too sleep-deprived to know it.



The study, published in the March 15 issue of the journal Sleep, found that chronically sleep-deprived individuals reported feeling "only slightly sleepy" even when their performance was at its worst during standard psychological testing. The results provide scientific insight into the daily challenges that confront military personnel, residents and on-call doctors and surgeons, shift workers, parents of young children, and others who routinely get fewer than six hours of sleep each night.

"Routine nightly sleep for fewer than six hours results in cognitive performance deficits, even if we feel we have adapted to it," said Hans P.A. Van Dongen, PhD, Assistant Professor of Sleep and Chronobiology in Penn’s Department of Psychiatry and corresponding author of the study. "This work demonstrates the importance of sleep as a necessity for health and well-being. Even relatively moderate sleep restriction, if it is sustained night after night, can seriously impair our neurobiological functioning."

David F. Dinges, PhD, Professor of Psychology in the Department of Psychiatry and Chief of the Division of Sleep and Chronobiology, served as principal investigator for the study.

Dinges, Van Dongen and their colleagues looked at the effects of four hours nightly sleep and six more hours nightly sleep on healthy volunteer subjects aged 21 to 38, over a two-week period. They compared the results of the subjects’ accumulating performance deficits, determined by standard psychomotor vigilance and other cognitive tests, with similar test results obtained from subjects who had gone without sleep for more than three nights.

The first group of subjects experienced increasing lapses in psychomotor vigilance over days, resulting in a decline of performance that matched that of the subjects who went without sleep for 88 hours. At that level, the subjects suffered lapses in their ability to react that would put them at risk driving or flying an airplane. They were also less able to multi-task successfully.

"The physiologic expression of sleep in humans appears to have multiple functions, ranging from the metabolic to the neurocognitive," Van Dongen said.


###
Other scientists who worked on the study are Greg Maislin, MS, MA, also of Penn, and Janet M. Mullington, PhD, of Beth Israel Deaconess Medical Center and Harvard University.

The study was funded by the National Institute of Nursing Research of the National Institutes of Health with additional financial assistance from the National Center for Research Resources and the National Heart, Lung and Blood Institute.




Ellen O’Brien | EurekAlert!
Further information:
http://www.med.upenn.edu/

More articles from Health and Medicine:

nachricht A 'half-hearted' solution to one-sided heart failure
24.11.2017 | Boston Children's Hospital

nachricht New study points the way to therapy for rare cancer that targets the young
22.11.2017 | Rockefeller University

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: New proton record: Researchers measure magnetic moment with greatest possible precision

High-precision measurement of the g-factor eleven times more precise than before / Results indicate a strong similarity between protons and antiprotons

The magnetic moment of an individual proton is inconceivably small, but can still be quantified. The basis for undertaking this measurement was laid over ten...

Im Focus: Frictional Heat Powers Hydrothermal Activity on Enceladus

Computer simulation shows how the icy moon heats water in a porous rock core

Heat from the friction of rocks caused by tidal forces could be the “engine” for the hydrothermal activity on Saturn's moon Enceladus. This presupposes that...

Im Focus: Nanoparticles help with malaria diagnosis – new rapid test in development

The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.

Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Lightning, with a chance of antimatter

24.11.2017 | Earth Sciences

A huge hydrogen generator at the Earth's core-mantle boundary

24.11.2017 | Earth Sciences

Scientists find why CP El Niño is harder to predict than EP El Niño

24.11.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>