Sleep patterns in Amazon rubber tappers with and without electric light at home
Number of Authors: 8
2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, 14074Article in journal (Refereed) Published
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
IdentifiersURN: urn:nbn:se:su:diva-121886DOI: 10.1038/srep14074ISI: 000361039700006PubMedID: 26361226Local ID: P-3310OAI: oai:DiVA.org:su-121886DiVA: diva2:862480