Natural Light Exposure, Sleep and Depression among Day Workers and Shiftworkers at Arctic and Equatorial Latitudes
2015 (English)In: PLoS ONE, ISSN 1932-6203, Vol. 10, no 4, e0122078Article in journal (Refereed) Published
OBJECTIVES: This study aimed to investigate the relationship between individual natural light exposure, sleep need, and depression at two latitudes, one extreme with a few hours of light per day during winter, and the other with equal hours of light and darkness throughout the year.
METHODS: This cross-sectional study included a sample of Brazilian workers (Equatorial, n = 488 workers) and a Swedish sample (Arctic, n = 1,273).
RESULTS: The reported mean total natural light exposure per 4-week cycle differed significantly between the Equatorial and Arctic regions. However, shiftworkers from both sites reported similar hours of natural light exposure. Short light exposure was a predictor for insufficient sleep.
CONCLUSION: Reduced exposure to natural light appears to increase the perception of obtaining insufficient sleep. Arctic workers were more prone to develop depression than Equatorial workers.
Place, publisher, year, edition, pages
2015. Vol. 10, no 4, e0122078
Public Health, Global Health, Social Medicine and Epidemiology
IdentifiersURN: urn:nbn:se:su:diva-117075DOI: 10.1371/journal.pone.0122078ISI: 000353015800037PubMedID: 25874859Local ID: P3251OAI: oai:DiVA.org:su-117075DiVA: diva2:810047