Sleep deprivation affects us much more than prior theories have suggested, according to new research.
The research is not only one of the largest studies on sleep, but also the first to assess how sleep deprivation affects placekeeping—or, the ability to complete a series of steps without losing one’s place, despite potential interruptions.
“Our research showed that sleep deprivation doubles the odds of making placekeeping errors and triples the number of lapses in attention, which is startling,” Fenn says. “Sleep-deprived individuals need to exercise caution in absolutely everything that they do, and simply can’t trust that they won’t make costly errors. Oftentimes—like when behind the wheel of a car—these errors can have tragic consequences.”
By sharing their findings on the separate effects sleep deprivation has on cognitive function, Fenn—and coauthors Michelle Stepan, a doctoral candidate and Erik Altmann, professor of psychology—hope that people will acknowledge how significantly their abilities are hindered because of a lack of sleep.
“Our findings debunk a common theory that suggests that attention is the only cognitive function affected by sleep deprivation,” says coauthor Michelle Stepan, a doctoral candidate. “Some sleep-deprived people might be able to hold it together under routine tasks, like a doctor taking a patient’s vitals. But our results suggest that completing an activity that requires following multiple steps, such as a doctor completing a medical procedure, is much riskier under conditions of sleep deprivation.”
The researchers recruited 138 people to participate in the overnight sleep assessment; 77 stayed awake all night and 61 went home to sleep. All participants took two separate cognitive tasks in the evening: one that measured reaction time to a stimulus; the other measured a participant’s ability to maintain their place in a series of steps without omitting or repeating a step—even after sporadic interruptions. The participants then repeated both tasks in the morning to see how sleep-deprivation affected their performance.
“After being interrupted there was a 15% error rate in the evening and we saw that the error rate spiked to about 30% for the sleep-deprived group the following morning,” Stepan says. “The rested participants’ morning scores were similar to the night before.
“There are some tasks people can do on auto-pilot that may not be affected by a lack of sleep,” Fenn says. “However, sleep deprivation causes widespread deficits across all facets of life.”
The study will appear in the Journal of Experimental Psychology: General.
Source: Michigan State University