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Sleep patterns in Amazon rubber tappers with and without electric light at home
Stockholm University, Faculty of Social Sciences, Stress Research Institute. University of São Paulo, Brazil.
Stockholm University, Faculty of Social Sciences, Stress Research Institute. (Biologisk psykologi och behandlingsforskning)
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Number of Authors: 8
2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, 14074Article in journal (Refereed) Published
Abstract [en]

Today's modern society is exposed to artificial electric lighting in addition to the natural light-dark cycle. Studies assessing the impact of electric light exposure on sleep and its relation to work hours are rare due to the ubiquitous presence of electricity. Here we report a unique study conducted in two phases in a homogenous group of rubber tappers living and working in a remote area of the Amazon forest, comparing those living without electric light (n = 243 in first phase; n = 25 in second phase) to those with electric light at home (n = 97 in first phase; n = 17 in second phase). Questionnaire data (Phase 1) revealed that rubber tappers with availability of electric light had significantly shorter sleep on work days (30 min/day less) than those without electric light. Analysis of the data from the Phase 2 sample showed a significant delay in the timing of melatonin onset in workers with electric light compared to those without electric light (p < 0.01). Electric lighting delayed sleep onset and reduced sleep duration during the work week and appears to interfere with alignment of the circadian timing system to the natural light/dark cycle.

Place, publisher, year, edition, pages
2015. Vol. 5, 14074
National Category
Health Sciences
URN: urn:nbn:se:su:diva-121886DOI: 10.1038/srep14074ISI: 000361039700006PubMedID: 26361226Local ID: P-3310OAI: diva2:862480
Available from: 2015-10-22 Created: 2015-10-19 Last updated: 2015-12-30Bibliographically approved

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