Natural Light Exposure, Sleep and Depression among Day Workers and Shiftworkers at Arctic and Equatorial Latitudes

Marqueze, Elaine Cristina; Vasconcelos, Suleima Pedroza; Garefelt, Johanna; Skene, Debra J.; Moreno, Cláudia Roberta de Castro; Löwden, Arne

doi:10.1371/journal.pone.0122078

Cited by 33 publications

(29 citation statements)

References 60 publications

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“…The present study indicates that, even in an industrialized population with a Western lifestyle, natural daylight exposure differences still have a marked influence on sleep timing and daytime sleepiness. It is likely that the dark season causes light deficits which increase the risk for circadian misalignment, and social jetlag, and may also contribute to other negative health consequences on sleep and mental health [13,21].…”

Section: Discussionmentioning

confidence: 99%

“…Similar data is found among groups with scarce daylight exposure. Data suggest that underexposure to natural light at work may significantly impair sleep and wake disorders in low or non-light exposed workers [12,13]. In one study, sleep started 34 min later, and waking 35 min later, during the dark period (December) compared with brighter photoperiods [14].…”

Section: Introductionmentioning

confidence: 99%

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Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers

et al. 2018

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers

et al. 2018

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“…Momoko Kayaba, PhD 1,2 , Hitomi Ogata, PhD 3,4 , Insung Park, PhD 1,3 , Asuka Ishihara, BA 1,5 , Fusae Kawana, BSc, RPSGT 1,6 , Toshio Kokubo, PhD 1 , Shoji Fukusumi, PhD 1 , Michiko Hayashi, PhD 1 , Kumpei Tokuyama, PhD 1,3 , Masashi Yanagisawa, MD, PhD 1 , Makoto Satoh, MD, PhD 1 comfort" have been used to describe the different types of mattresses used [8][9][10], while some studies provided no detailed information about their mattresses [11,12], making experiments difficult to repeat. Other studies evaluated the effects of mattresses on pressure distribution and spinal distortion but did not measure sleep quality [13][14][15][16].…”

Section: Improvement Of Slow Wave Sleep Continuity By Mattress With Bmentioning

confidence: 99%

“…Over past few decades, the importance of sleep and its consequences on our health has gained greater recognition, in which sleep problems, such as insomnia, insufficient sleep and other sleep disorders, have become common in the modern society. There has been an extensive study in epidemiology and physiology on the aspects of individual's health and social status relating to sleep, in addition to sleeping environments, such as noise [1,2], light [3][4][5], thermal conditions [6], and other residential factors [7]. There has also been an increase in public interest on the sleeping environment, including the functions and materials used in the bedding systems [8].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Slow Wave Sleep Continuity by Mattress with Better Body Pressure Dispersal

et al. 2019

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Background and ObjectiveaaThis study evaluated the effects of a mattress with better body pressure dispersal in comparison to a control mattress on sleep quality. MethodsaaIn this randomized crossover study, 10 healthy young men slept in an experimental sleep room on either a functional mattress made from polyurethane, with a special four-layer three-dimensional structure, or a control mattress made from solid polyester wadding, which is a mattress commercially available in Japan. Polysomnography recordings were used to characterize sleep architecture, and the length of slow wave sleep (SWS) episodes and delta power density were calculated from the electroencephalography data and subjective sleep quality was evaluated by questionnaire they answered after waking. ResultsaaThere were no significant differences in sleep latency, the total duration of each sleep stages, total sleep time, or sleep efficiency. Although the difference was subtle, delta power density significantly increased with the functional mattress. There was no difference in the total duration of SWS, but there were significantly fewer SWS episodes with the functional mattress (10.3 ± 1.8) than with the control mattress (16.9 ± 1.2) and longer SWS episode duration (10.9 ± 1.7 min) with the functional mattress than with the control mattress (5.6 ± 0.5 min). ConclusionsaaIt was suggested that the functional mattress lengthened SWS episode duration, and its fragmentation was effective in evaluating the sleep quality of healthy young individuals. Sleep Med Res 2019;10(2):75-82

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“…Assim, a alteração dos horá-rios de sono pelo trabalho, como no caso dos trabalhadores noturnos, ocasiona mudanças significativas nos mecanismos de consolidação das memórias e na liberação de hormônios, como o cortisol e a melatonina. 23 De fato, o trabalho em turnos vem sendo associado a diversas enfermidades, entre elas destaca-se o ganho de peso corporal e risco metabólico aumentado 24 , depressão 25 , câncer de próstata 26,27 e de mama. 27,28 Especialmente entre trabalhadores noturnos, recente pesquisa, constatou diminuição considerável do desempenho funcional no local de trabalho gerado pelo cansaço e fadiga.…”

Section: Tabelaunclassified

Absenteísmo na Indústria está Associado com o Trabalho em Turnos e com Problemas no Sono

et al. 2017

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RESUMOIntrodução: Cada vez mais as indústrias mantêm seu volume de produção durante as 24h horas do dia. Esta reorganização temporal traz repercussões importantes para a saúde do trabalhador. O objetivo deste estudo foi analisar os fatores associados ao absenteísmo em trabalhadores de diferentes turnos de uma indústria de grande porte do sul do Brasil. Método: A amostra foi composta por 885 profissionais com média de idade de 31,1(8,5) anos de uma indústria do setor de telecomunicação. A variável dependente foi avaliada por meio de faltas ao trabalho nos últimos 12 meses por motivos de saúde. Resultados: A frequência de absenteísmo foi de 16,6%. Os fatores associados ao desfecho foram a idade avançada (OR=2,16; IC95%= 1,27-3,67), o trabalho em turnos extremos, primeiro turno (OR=1,91; IC95%= 1,08-3,36) e terceiro turno (OR=2,06; IC95%= 1,01-4,25), percepção elevada de estresse (OR=1,74; IC95%= 1,07 -2,82) e os distúrbios do sono (OR=2,03; IC95%= 1,07-3,76). Não foram identificadas associações entre absenteísmo e fatores de estilo de vida como prática de atividade física e consumo de álcool e tabaco. Conclusão: Trabalhadores com distúrbios de sono e que exercem suas funções em turnos extremos (manhã ou noite) possuíram mais chance de faltar ao trabalho por questões de saúde. ABSTRACTIntroduction: Increasingly the industry maintains its production volume during the 24 hours of the day. This time reorganization has important implications for workers' health The aim of this study was to analyze factors associated with absenteeism among workers in different shifts of a large industry in southern Brazil. Methods: The sample consisted of 885 professionals with an average age of 31.1 (8.5) years of the telecommunication sector industry. The dependent variable was assessed by absence from work in the last 12 months for health reasons. Results: The absenteeism rate was 16.6%. Factors associated with outcome were advanced age (OR = 2.16, 95% CI 1.27 to 3.67), work in extreme shifts, first round (OR = 1.91, 95% CI 1.08 3.36) and third round (OR = 2.06, 95% CI 1.01 to 4.25), high perceived stress (OR = 1.74, 95% CI 1.07 to 2.82) and sleep disorders (OR = 2.03, 95% CI 1.07 to 3.76). No associations were found between absenteeism and lifestyle factors such as physical activity and consumption of alcohol and tobacco. Conclusion: Workers with sleep disorders and perform their duties in extreme shifts (morning or night) possessed more likely to miss work for health reasons.

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Natural Light Exposure, Sleep and Depression among Day Workers and Shiftworkers at Arctic and Equatorial Latitudes

Cited by 33 publications

References 60 publications

Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers

Delayed Sleep in Winter Related to Natural Daylight Exposure among Arctic Day Workers

Improvement of Slow Wave Sleep Continuity by Mattress with Better Body Pressure Dispersal

Absenteísmo na Indústria está Associado com o Trabalho em Turnos e com Problemas no Sono

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