Research — 08 August 2012

Are you the type that can get by with less than eight hours of sleepa night? Do you believe your work performance is the same after a night of less than ideal sleep?

New research finds that even if you believe you do not feel tired, a lack of sleep can influence the way you perform certain tasks.

Researchers at Brigham and Women’s Hospital (BWH) published their findings in the online edition of The Journal of Vision.

“Our team decided to look at how sleep might affect complex visual search tasks, because they are common in safety-sensitive activities, such as air-traffic control, baggage screening, and monitoring power plant operations,” said Jeanne F. Duffy, Ph.D., M.B.A., senior author on this study.

“These types of jobs involve processes that require repeated, quick memory encoding and retrieval of visual information, in combination with decision-making about the information.”

In the study, researchers collected and analyzed data from visual search tasks from 12 participants over a one month study.

In the first week, all participants were scheduled to sleep 10-12 hours per night to make sure they were well-rested. For the following three weeks, the participants were scheduled to sleep the equivalent of 5.6 hours per night, and also had their sleep times scheduled on a 28-hour cycle, mirroring chronic jet lag.

In the experiment, participants were given computer tests that involved visual search tasks. Computer software recorded how quickly the participants could find important information, and also how accurate they were in identifying it.

The researchers report that the longer the participants were awake, the more slowly they identified the important information in the test.

Additionally, during the biological night time, 12 a.m. -6 a.m., participants (who were unaware of the time throughout the study) also performed the tasks more slowly than they did during the daytime.

“This research provides valuable information for workers, and their employers, who perform these types of visual search tasks during the night shift, because they will do it much more slowly than when they are working during the day,” said Duffy.

“The longer someone is awake, the more the ability to perform a task, in this case a visual search, is hindered, and this impact of being awake is even stronger at night.”

As the research evolved, the accuracy of the participants stayed the fairly constant although they were slower to identify the relevant information as the weeks went on.

While individual’s perceptions of the effects of sleepiness increased only slightly during the second and third weeks on the study schedule, researchers discovered that they were performing the visual search tasks significantly slower than in the first week.

This finding suggests that someone’s perceptions of how tired they are do not always match their performance ability, Duffy said.

As first appeared in PsychCentral


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