Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers
Natural daylight exposures in arctic regions vary substantially across seasons. Negative consequences have been observed in self-reports of sleep and daytime functions during the winter but have rarely been studied in detail. The focus of the present study set out to investigate sleep seasonality am...
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Stockholms universitet, Stressforskningsinstitutet
2018
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-162598 https://doi.org/10.3390/clockssleep1010010 |
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ftstockholmuniv:oai:DiVA.org:su-162598 2023-05-15T14:59:58+02:00 Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers Lowden, Arne Lemos, Nelson A. M. Gonçalves, Bruno S. B. Öztürk, Gülçin Louzada, Fernando Pedrazzoli, Mario Moreno, Claudia R. 2018 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-162598 https://doi.org/10.3390/clockssleep1010010 eng eng Stockholms universitet, Stressforskningsinstitutet University of São Paulo, Brazil Clocks & Sleep, 2018, 1:1, s. 105-116 orcid:0000-0002-6980-2971 orcid:0000-0003-1839-9673 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-162598 doi:10.3390/clockssleep1010010 info:eu-repo/semantics/openAccess actigraph circadian entrainment high latitude human jetlag light exposure season sleepiness sleep schedule Psychology Psykologi Article in journal info:eu-repo/semantics/article text 2018 ftstockholmuniv https://doi.org/10.3390/clockssleep1010010 2023-02-23T21:43:46Z Natural daylight exposures in arctic regions vary substantially across seasons. Negative consequences have been observed in self-reports of sleep and daytime functions during the winter but have rarely been studied in detail. The focus of the present study set out to investigate sleep seasonality among indoor workers using objective and subjective measures. Sleep seasonality among daytime office workers (n = 32) in Kiruna (Sweden, 67.86° N, 20.23° E) was studied by comparing the same group of workers in a winter and summer week, including work and days off at the weekend, using actigraphs (motion loggers) and subjective ratings of alertness and mood. Actigraph analyses showed delayed sleep onset of 39 min in winter compared to the corresponding summer week (p < 0.0001) and shorter weekly sleep duration by 12 min (p = 0.0154). A delay of mid-sleep was present in winter at workdays (25 min, p < 0.0001) and more strongly delayed during days off (46 min, p < 0.0001). Sleepiness levels were higher in winter compared to summer (p < 0.05). Increased morning light exposure was associated with earlier mid-sleep (p < 0.001), while increased evening light exposure was associated with delay (p < 0.01). This study confirms earlier work that suggests that lack of natural daylight delays the sleep/wake cycle in a group of indoor workers, despite having access to electric lighting. Photic stimuli resulted in a general advanced sleep/wake rhythm during summer and increased alertness levels. Article in Journal/Newspaper Arctic Kiruna Stockholm University: Publications (DiVA) Arctic Kiruna Clocks & Sleep 1 1 105 116 |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
actigraph circadian entrainment high latitude human jetlag light exposure season sleepiness sleep schedule Psychology Psykologi |
spellingShingle |
actigraph circadian entrainment high latitude human jetlag light exposure season sleepiness sleep schedule Psychology Psykologi Lowden, Arne Lemos, Nelson A. M. Gonçalves, Bruno S. B. Öztürk, Gülçin Louzada, Fernando Pedrazzoli, Mario Moreno, Claudia R. Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers |
topic_facet |
actigraph circadian entrainment high latitude human jetlag light exposure season sleepiness sleep schedule Psychology Psykologi |
description |
Natural daylight exposures in arctic regions vary substantially across seasons. Negative consequences have been observed in self-reports of sleep and daytime functions during the winter but have rarely been studied in detail. The focus of the present study set out to investigate sleep seasonality among indoor workers using objective and subjective measures. Sleep seasonality among daytime office workers (n = 32) in Kiruna (Sweden, 67.86° N, 20.23° E) was studied by comparing the same group of workers in a winter and summer week, including work and days off at the weekend, using actigraphs (motion loggers) and subjective ratings of alertness and mood. Actigraph analyses showed delayed sleep onset of 39 min in winter compared to the corresponding summer week (p < 0.0001) and shorter weekly sleep duration by 12 min (p = 0.0154). A delay of mid-sleep was present in winter at workdays (25 min, p < 0.0001) and more strongly delayed during days off (46 min, p < 0.0001). Sleepiness levels were higher in winter compared to summer (p < 0.05). Increased morning light exposure was associated with earlier mid-sleep (p < 0.001), while increased evening light exposure was associated with delay (p < 0.01). This study confirms earlier work that suggests that lack of natural daylight delays the sleep/wake cycle in a group of indoor workers, despite having access to electric lighting. Photic stimuli resulted in a general advanced sleep/wake rhythm during summer and increased alertness levels. |
format |
Article in Journal/Newspaper |
author |
Lowden, Arne Lemos, Nelson A. M. Gonçalves, Bruno S. B. Öztürk, Gülçin Louzada, Fernando Pedrazzoli, Mario Moreno, Claudia R. |
author_facet |
Lowden, Arne Lemos, Nelson A. M. Gonçalves, Bruno S. B. Öztürk, Gülçin Louzada, Fernando Pedrazzoli, Mario Moreno, Claudia R. |
author_sort |
Lowden, Arne |
title |
Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers |
title_short |
Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers |
title_full |
Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers |
title_fullStr |
Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers |
title_full_unstemmed |
Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers |
title_sort |
delayed sleep in winter related to natural daylight exposure among arctic day workers |
publisher |
Stockholms universitet, Stressforskningsinstitutet |
publishDate |
2018 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-162598 https://doi.org/10.3390/clockssleep1010010 |
geographic |
Arctic Kiruna |
geographic_facet |
Arctic Kiruna |
genre |
Arctic Kiruna |
genre_facet |
Arctic Kiruna |
op_relation |
Clocks & Sleep, 2018, 1:1, s. 105-116 orcid:0000-0002-6980-2971 orcid:0000-0003-1839-9673 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-162598 doi:10.3390/clockssleep1010010 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3390/clockssleep1010010 |
container_title |
Clocks & Sleep |
container_volume |
1 |
container_issue |
1 |
container_start_page |
105 |
op_container_end_page |
116 |
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1766332088639815680 |