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Author Esaki, Y.; Kitajima, T.; Obayashi, K.; Saeki, K.; Fujita, K.; Iwata, N.
Title Light exposure at night and sleep quality in bipolar disorder: the APPLE cohort study Type Journal Article
Year 2019 Publication Journal of Affective Disorders Abbreviated Journal Journal of Affective Disorders
Volume 257 Issue Pages 314-320
Keywords Human Health; mood disorders; Bipolar Disorder; Sleep; sleep efficiency; sleep quality
Abstract Background

Sleep disturbance in bipolar disorder (BD) is common and is associated with a risk for mood episode recurrence. Thus, it is important to identify factors that are related to sleep disturbance in BD. This cross-sectional study investigated the association between exposure to light at night (LAN) and sleep parameters in patients with BD.

Methods

The sleep parameters of 175 outpatients with BD were recorded using actigraphy at their homes for seven consecutive nights and were evaluated using the Insomnia Severity Index (ISI). The average LAN intensity in the bedroom during bedtime and rising time was measured using a portable photometer, and the participants were divided into two groups: “Light” (≥5 lux) and “Dark” (<5 lux). The association between LAN and sleep parameters was tested with multivariable analysis by adjusting for potential confounder such as age, gender, current smoker, mood state, day length, daytime light exposure, and sedative medications.

Results

After adjusting for potential confounder, the actigraphy sleep parameters showed significantly lower sleep efficiency (mean, 80.1% vs. 83.4%; p = 0.01), longer log-transformed sleep onset latency (2.9 vs. 2.6 min; p = 0.01), and greater wake after sleep onset (51.4 vs. 41.6 min; p = 0.02) in the Light group than in the Dark group. Whereas, there were no significant differences in the ISI scores between the groups.

Limitations

This was a cross-sectional study; therefore, the results do not necessarily imply that LAN causes sleep disturbance.

Conclusions

Reducing LAN exposure may contribute to improved sleep quality in patients with BD.
Address Department of Psychiatry, Okehazama Hospital, Aichi, Japan; esakiz(at)fujita-hu.ac.jp
Corporate Author Thesis
Publisher Elsevier Place of Publication Editor
Language English Summary Language (down) English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0165-0327 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2561
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Author Columella, L.J.M.
Title Of husbandry Type Journal Article
Year 70 Publication Abbreviated Journal
Volume Book 9 Issue Pages
Keywords Animals
Abstract Excerpt from Chapter 14, page 409 in the linked English translation:

...Therefore, at the time when the mallows blossom, when there is the greatest multitude of these butterflies, if a high brazen vessel, with a narrow neck like the mile-column, be placed in the evening among the bee-hives, and some light put down to the bottom of it, the butterflies gather together to it from all places; and, while they flutter about the small flame, they are scorched, because they can neither fly easily upward out of the narrow place, nor, on the other hand, can they retire at a greater distance from the fire, since they are surrounded by the sides of the brazen vessel: therefore they are consumed by the burning heat that is near them...
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Latin Summary Language (down) English Original Title De re rustica
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2578
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Author Kim, K.-M.; Kim, Y.-W.; Oh, S.-T.; Lim, J.-H.
Title Development of a natural light reproduction system for maintaining the circadian rhythm Type Journal Article
Year 2019 Publication Indoor and Built Environment Abbreviated Journal Indoor and Built Environment
Volume in press Issue Pages 1420326X19855421
Keywords Lighting; Human Health; Circadian Rhythm; indoor light
Abstract Circadian rhythm is linked to sleep, arousal and human health overall, affecting body temperature and heart rate. A 24-h natural-light cycle provides optimum lighting environment for humans. However, as people increasingly stay indoors with artificial lighting, lacking periodic characteristics, imbalance in the circadian rhythm ensues. Previous lighting-related studies to resolve such problem partially provided the colour temperatures of natural light but failed to reproduce the 24-h periodic characteristics of it. This study proposes a natural light-reproducing system that provides the daylight cycle characteristics of natural light in order to maintain the circadian rhythm. Natural light was measured through an optical measurement equipment, while the characteristics (colour temperature and short-wavelength ratio) of natural light by season and time were analysed. Subsequently, the control indicator of seasonal and hourly lighting was extracted and applied to the light-emitting diode lighting to provide lighting service, executing a daylight cycle that reflects the characteristics of natural light. After the sunset, especially, the circadian rhythm was maintained by minimizing the short-wavelength ratio of the lighting while maintaining indoor illumination.
Address Department of Computer Science & Engineering, Kongju National University, Cheonan-si, South Korea
Corporate Author Thesis
Publisher Sage Place of Publication Editor
Language English Summary Language (down) English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1420-326X ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2591
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Author Falchi, F.; Furgoni, R.; Gallaway, T.A.; Rybnikova, N.A.; Portnov, B.A.; Baugh, K.; Cinzano, P.; Elvidge, C.D.
Title Light pollution in USA and Europe: The good, the bad and the ugly Type Journal Article
Year 2019 Publication Journal of Environmental Management Abbreviated Journal Journal of Environmental Management
Volume 248 Issue Pages 109227
Keywords Remote Sensing; gross domestic product; light pollution; Economics
Abstract Light pollution is a worldwide problem that has a range of adverse effects on human health and natural eco-systems. Using data from the New World Atlas of Artificial Night Sky Brightness, VIIRS-recorded radiance and Gross Domestic Product (GDP) data, we compared light pollution levels, and the light flux to the population size and GDP at the State and County levels in the USA and at Regional (NUTS2) and Province (NUTS3) levels inEurope. We found 6800-fold differences between the most and least polluted regions in Europe, 120-fold differences in their light flux per capita, and 267-fold differences influx per GDP unit. Yet, we found even greater differences between US counties: 200,000-fold differences in sky pollution, 16,000-fold differences in light flux per capita, and 40,000-fold differences in light flux per GDP unit. These findings may inform policy-makers, helping to reduce energy waste and adverse environmental, cultural and health consequences associated with light pollution.
Address STIL – Istituto di Scienza e Tecnologia dell'Inquinamento Luminoso, Light Pollution Science and Technology Institute, Thiene, Italy; Italy. falchi@lightpollution.it(at)istil.it
Corporate Author Thesis
Publisher Elsevier Place of Publication Editor
Language English Summary Language (down) English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0301-4797 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 2593
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Author Obayashi, K.; Yamagami, Y.; Kurumatani, N.; Saeki, K.
Title Bedroom lighting environment and incident diabetes mellitus: a longitudinal study of the HEIJO-KYO cohort Type Journal Article
Year 2019 Publication Sleep Medicine Abbreviated Journal Sleep Medicine
Volume 65 Issue Pages 1-3
Keywords Human Health; Metabolic disorders; diabetes; geriatrics
Abstract Objectives

Light information received by the brain influences human circadian timing and metabolism; low-level light at night (LAN) significantly increased body mass and led to prediabetes in mice. We hypothesized that LAN exposure increases the diabetes risk in humans. The aim of the present study was to evaluate a longitudinal association between LAN exposure and the incidence of diabetes in a general population.

Methods

In our prospective cohort study, bedroom light intensity was measured at 1-min intervals in 678 elderly participants without diabetes at baseline. The average light intensity recorded between bedtimes and rise times over two consecutive nights was used in the analysis.

Results

During follow-up (median, 42 months), 19 of the 678 participants (mean age, 70.6 years) developed diabetes. Poisson regression models revealed that the incidence rate for diabetes was significantly higher in the LAN group (average ≥5 lux, N = 128) than the dark group (average <5 lux, N = 550) (incidence rate ratio, 3.74; 95% confidence interval (CI), 1.55–9.05; p=0.003). Further propensity score adjustments in relation to LAN produced consistent results (incidence rate ratio, 3.19; 95% CI, 1.38–7.35; p=0.007). When the cut-off value of LAN was decreased to 3 lux, the relationship remained significant (incidence rate ratio 2.74; 95% CI, 1.19–6.33; p=0.018).

Conclusions

Our findings suggest that LAN exposure increases the incidence of diabetes in a general elderly population. Further research involving a large cohort with new-onset diabetes is warranted to elucidate these findings.
Address Department of Epidemiology, Nara Medical University School of Medicine, 840 Shijocho, Kashiharashi, Nara, 634-8521, Japan; obayashi(at)naramed-u.ac.jp
Corporate Author Thesis
Publisher Elsevier Place of Publication Editor
Language English Summary Language (down) English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1389-9457 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2605
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