Featured Research

from universities, journals, and other organizations

Weekend sleep fails to improve performance, but women handle workweek sleep loss better

Date:
June 16, 2011
Source:
American Academy of Sleep Medicine
Summary:
Performance decreases significantly after six nights of sleep restriction and did not improve after two nights of recovery sleep, a new study has found. Sleep restriction also caused subjective and objective sleepiness to increase significantly; however, sleepiness did improve after recovery. Compared with men, women were found to have less subjective sleepiness and less performance deterioration during sleep restriction, and greater improvements after recovery. These differences were associated with increased amounts of slow-wave sleep in women at baseline.

Performance deteriorates when sleep is restricted to six hours per night for a week and does not improve after two nights of recovery sleep. However, women may be less affected than men by this workweek pattern of sleep loss, suggests a research abstract being presented in Minneapolis, Minn., at SLEEP 2011, the 25th Anniversary Meeting of the Associated Professional Sleep Societies LLC (APSS).

Results show that, in both men and women, performance decreased significantly after six nights of sleep restriction and did not improve after two nights of recovery sleep, suggesting that complete performance recovery may require more than just two nights of extended sleep. Sleep restriction also caused subjective and objective sleepiness to increase significantly; however, sleepiness did improve after recovery.

"After one workweek of mild sleep deprivation, two recovery nights were adequate in improving sleepiness but not performance," said principal investigator Dr. Alexandros N. Vgontzas, professor of psychiatry and endowed chair in sleep disorders medicine at the Penn State College of Medicine and director of the Sleep Research and Treatment Center at the Penn State Milton S. Hershey Medical Center in Hershey, Pa. "The usual practice of extending sleep during the weekend after a busy workweek associated with mild sleep loss is not adequate in reversing the cumulative effects on cognitive function resulting from this mild sleep deprivation."

The study also found significant gender differences. Compared with men, women were found to have less subjective sleepiness and less performance deterioration during sleep restriction, as well as greater improvements after recovery. These differences were associated with increased amounts of slow-wave sleep, or "deep sleep," in women at baseline.

"In women, but not in men, deep sleep appeared to have a protective effect," said Vgontzas. "Women with a higher amount of deep sleep can handle better the effects of one workweek of mild sleep deprivation, and their recovery is more complete after two nights of extended sleep."

According to the American Academy of Sleep Medicine, slow-wave sleep, or deep sleep, is one of the sleep stages that make up a sleep cycle. Each complete cycle lasts about 90 to 110 minutes. Most adults will go through four to six cycles in a full night of sleep. During slow-wave sleep, there is an increase in high-amplitude, slow-wave brain activity, known as delta waves.

The study involved 34 normal sleepers: 16 men and 18 women. They had a mean age of 24.5 years. Participants spent 13 consecutive nights in a sleep lab, sleeping eight hours per night for the first four nights as a baseline measurement. Then sleep was restricted to six hours per night for six nights, followed by three recovery nights of 10 hours of sleep.

Sleepiness was measured subjectively using the Stanford Sleepiness Scale and objectively using the Multiple Sleep Latency Test. Performance was measured using the Psychomotor Vigilance Task. Measurements were taken on the fourth day for baseline data, on day 10 after one week of sleep restriction, and on day 13 after two nights of recovery sleep.


Story Source:

The above story is based on materials provided by American Academy of Sleep Medicine. Note: Materials may be edited for content and length.


Cite This Page:

American Academy of Sleep Medicine. "Weekend sleep fails to improve performance, but women handle workweek sleep loss better." ScienceDaily. ScienceDaily, 16 June 2011. <www.sciencedaily.com/releases/2011/06/110615015650.htm>.
American Academy of Sleep Medicine. (2011, June 16). Weekend sleep fails to improve performance, but women handle workweek sleep loss better. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2011/06/110615015650.htm
American Academy of Sleep Medicine. "Weekend sleep fails to improve performance, but women handle workweek sleep loss better." ScienceDaily. www.sciencedaily.com/releases/2011/06/110615015650.htm (accessed July 22, 2014).

Share This




More Health & Medicine News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Courts Conflicted Over Healthcare Law

Courts Conflicted Over Healthcare Law

AP (July 22, 2014) Two federal appeals courts issued conflicting rulings Tuesday on the legality of the federally-run healthcare exchange that operates in 36 states. (July 22) Video provided by AP
Powered by NewsLook.com
Why Do People Believe We Only Use 10 Percent Of Our Brains?

Why Do People Believe We Only Use 10 Percent Of Our Brains?

Newsy (July 22, 2014) The new sci-fi thriller "Lucy" is making people question whether we really use all our brainpower. But, as scientists have insisted for years, we do. Video provided by Newsy
Powered by NewsLook.com
Scientists Find New Way To Make Human Platelets

Scientists Find New Way To Make Human Platelets

Newsy (July 22, 2014) Boston scientists have discovered a new way to create fully functioning human platelets using a bioreactor and human stem cells. Video provided by Newsy
Powered by NewsLook.com
Gilead's $1000-a-Pill Drug Could Cure Hep C in HIV-Positive People

Gilead's $1000-a-Pill Drug Could Cure Hep C in HIV-Positive People

TheStreet (July 21, 2014) New research shows Gilead Science's drug Sovaldi helps in curing hepatitis C in those who suffer from HIV. In a medical study, the combination of Gilead's Hep C drug with anti-viral drug Ribavirin cured 76% of HIV-positive patients suffering from the most common hepatitis C strain. Hepatitis C and related complications have been a top cause of death in HIV-positive patients. Typical medication used to treat the disease, including interferon proteins, tended to react badly with HIV drugs. However, Sovaldi's %1,000-a-pill price tag could limit the number of patients able to access the treatment. TheStreet's Keris Lahiff reports from New York. Video provided by TheStreet
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins