In addition to enabling us to see the world, light has potent impacts on a variety of brain and circadian functions. Whether the daytime pattern of this light exposure has an impact on these downstream functions is not well described. In the present study, we compared the effects of static and dynamic daytime lighting scenarios, matched for average illuminance but differing in temporal distribution, on the sleep, alertness, and cognitive performance of home-based workers residing in the Phoenix metro area, whose home office lighting levels were substantially below those recommended for non-visual responses. The static lighting scenario maintained constant light intensity and correlated color temperature (CCT), whereas the dynamic scenario mimicked daylight by varying light intensity and CCT levels throughout the working hours. In a five-week counterbalanced randomized crossover design, objective sleep, subjective alertness, and cognitive performance under the two lighting interventions were measured in 20 participants. While the different lighting scenarios did not lead to differences in most of the objective sleep outcomes, effects of both lighting conditions were observed on global cognitive scores and specific cognitive domains including working memory. This study provides preliminary evidence that enhancing light exposure in home-based office environments may support the well-being and productivity of remote workers, suggesting a promising area for further research and application.
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