Workers exposed to daylight have better quality of life.

A new study has demonstrated a strong relationship between workplace daylight exposure and office workers- sleep, activity and quality of life. Compared to workers in offices without windows in the workplace, and those with windows in the workplace received 173 percent more white light exposure during work hours and slept an average of 46 minutes more per night. 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 there counterparts on quality of life measures related to physical problems and vitality, as well as poorer outcome on measures of overall sleep quality, sleep efficiency, sleep disturbances and daytime dysfunction. "The extent to which daylight exposure impacts office workers is remarkable," study co author Ivy Cheung, a doctoral candidate in the Interdepartmental Neuroscience program at Northwestern University at Chicago, Illinois said.