Blue-light glasses improve your sleep and work

Wearing blue-light glasses just before sleeping can lead to a better night’s sleep and contribute to a better day’s work to follow, new research shows.

“We found that wearing blue-light-filtering glasses is an effective intervention to improve sleep, work engagement, task performance and organizational citizenship behavior, and reduced counterproductive work behavior,” says Cristiano L. Guarana, assistant professor of management and entrepreneurship at Indiana University’s Kelley School of Business.

“Wearing blue-light-filtering glasses creates a form of physiologic darkness, thus improving both sleep quantity and quality.”

Most of the technology we commonly use—such as computer screens, smartphones, and tablets—emits blue light, which past research has found can disrupt sleep. Workers have become more dependent on these devices, especially as we navigate remote work and school during the coronavirus pandemic.

Night owls and morning larks

The media have recently reported on the benefits of blue-light glasses for those spending a lot of time in front of a computer screen. The new research in the Journal of Applied Psychology extends understanding of the circadian rhythm, a natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.

“In general, the effects of wearing blue-light-filtering glasses were stronger for ‘night owls’ than for ‘morning larks,’” says Guarana, who previously has studied how lack of sleep affects business decisions, relationships, and other behaviors in organizations. “Owls tend to have sleep periods later in the day, whereas larks tend to have sleep periods early in the day.

“Although most of us can benefit from reducing our exposure to blue light, owl employees seem to benefit more because they encounter greater misalignments between their internal clock and the externally controlled work time. Our model highlights how and when wearing blue-light-filtering glasses can help employees to live and work better.”

The research shows that daily engagement and performance of tasks may be related to more underlying biological processes such as the circadian process.

“Our research pushes the chronotype literature to consider the relationship between the timing of circadian processes and employees’ performance,” the researchers write.

Benefits workers and the bottom line

A good night’s sleep not only benefits workers; it also helps their employers’ bottom line.

“This study provides evidence of a very cost-effective means of improving employee sleep and work outcomes, and the implied return on investment is gigantic,” says coauthor Christopher Barnes, professor of management at the University of Washington’s Foster School of Business. “I personally do not know of any other interventions that would be that powerful at that low of a cost.”

Across two studies, researcher collected data from 63 company managers and 67 call center representatives at Brazil-based offices for a US multinational financial firm and measured task performance from clients. Participants were randomly chosen to test glasses that filtered blue light or those that were placebo glasses.

“Employees are often required to work early mornings, which may lead to a misalignment between their internal clock and the externally controlled work time,” the researchers say, adding that the new analyses showed a general pattern that blue-light filtration can have a cumulative effect on key performance variables, at least in the short term.

“Blue-light exposure should also be of concern to organizations,” Guarana says. “The ubiquity of the phenomenon suggests that control of blue-light exposure may be a viable first step for organizations to protect the circadian cycles of their employees from disruption.”

Wei Jee Ong of the University of Washington is also a coauthor. The Austin, Texas-based company Swanwick donated the glasses.

Source: University of Indiana

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