Workers with more light exposure at the office have longer sleep duration, better sleep quality, more physical activity and better quality of life compared to office workers with less light exposure in the workplace, according to a new study.
The study from Northwestern University and the University of Illinois highlights the importance of exposure to natural light to employee health and the priority architectural designs of office environments should place on natural daylight exposure for workers, the study authors said.
Employees with windows in the workplace received 173 per cent more white light exposure during work hours and slept an average of 46 minutes more per night than employees who did not have the natural light exposure in the workplace. There also was a trend for workers in offices with windows to have more physical activity than those without windows.
Workers without windows reported poorer scores than their counterparts on quality of life measures related to physical problems and vitality, as well as poorer outcomes on measures of overall sleep quality and sleep disturbances.
“There is increasing evidence that exposure to light, during the day — particularly in the morning — is beneficial to your health via its effects on mood, alertness and metabolism,” said senior study author Phyllis Zee, a Northwestern Medicine neurologist and sleep specialist. “Workers are a group at risk because they are typically indoors often without access to natural or even artificial bright light for the entire day.”
Architects need to be aware of the importance of natural light not only in terms of their potential energy savings but also in terms of affecting occupants’ health, said co-lead author Mohamed Boubekri, an associate professor of architecture at the University of Illinois.
A simple design solution to augment daylight penetration in office buildings would be to make sure the work stations are within 20 to 25 feet of the peripheral walls containing the windows, noted Boubekri.
”Daylight from side windows almost vanishes after 20 to 25 feet from the windows,” he said.
The study group included 49 day-shift office workers; 27 in windowless workplaces and 22 in workplaces with windows. Health-related quality of life and sleep quality were measured with a self-reported form and sleep quality was evaluated with the Pittsburgh Sleep Quality Index (PSQI). Light exposure, activity and sleep were measured by actigraphy in a representative subset of 21 participants; 10 in windowless workplaces and 11 in workplaces with windows. Actigraphy is a single device worn on the wrist that gives measures of light exposure as well as activity and sleep.