Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers
| Autor: | Arne Lowden, Gülcin Öztürk, Bruno S B Gonçalves, Mario Pedrazzoli, Nelson A. M. Lemos, Claudia Roberta de Castro Moreno, Fernando Mazzilli Louzada |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Evening sleepiness Article 03 medical and health sciences light exposure 0302 clinical medicine Rhythm PÓLO NORTE Psychology Daylight human jetlag General Environmental Science Morning Psykologi circadian entrainment high latitude sleep schedule Sleep in non-human animals Alertness 030104 developmental biology Mood General Earth and Planetary Sciences actigraph season Sleep onset 030217 neurology & neurosurgery Demography |
| Zdroj: | Clocks & Sleep Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Clocks & Sleep; Volume 1; Issue 1; Pages: 105-116 |
| ISSN: | 2624-5175 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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