| Records |
| Author |
Walch, O.J.; Cochran, A.; Forger, D.B. |
| Title |
A global quantification of “normal” sleep schedules using smartphone data |
Type |
Journal Article |
| Year |
2016 |
Publication |
Science Advances |
Abbreviated Journal |
Science Advances |
| Volume |
2 |
Issue |
5 |
Pages  |
e1501705-e1501705 |
| Keywords |
Human Health; Sleep; *Circadian Rhythm; smartphone; society |
| Abstract |
The influence of the circadian clock on sleep scheduling has been studied extensively in the laboratory; however, the effects of society on sleep remain largely unquantified. We show how a smartphone app that we have developed, ENTRAIN, accurately collects data on sleep habits around the world. Through mathematical modeling and statistics, we find that social pressures weaken and/or conceal biological drives in the evening, leading individuals to delay their bedtime and shorten their sleep. A country’s average bedtime, but not average wake time, predicts sleep duration. We further show that mathematical models based on controlled laboratory experiments predict qualitative trends in sunrise, sunset, and light level; however, these effects are attenuated in the real world around bedtime. Additionally, we find that women schedule more sleep than men and that users reporting that they are typically exposed to outdoor light go to sleep earlier and sleep more than those reporting indoor light. Finally, we find that age is the primary determinant of sleep timing, and that age plays an important role in the variability of population-level sleep habits. This work better defines and personalizes “normal†sleep, produces hypotheses for future testing in the laboratory, and suggests important ways to counteract the global sleep crisis. |
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Edition |
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| ISSN |
2375-2548 |
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Approved |
no |
| Call Number |
LoNNe @ kyba @ |
Serial |
1440 |
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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 |
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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 |
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| Publisher |
Sage |
Place of Publication |
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| Language |
English |
Summary Language |
English |
Original Title |
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Edition |
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| ISSN |
1420-326X |
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Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
2591 |
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| Author |
Pilorz, V.; Tam, S.K.E.; Hughes, S.; Pothecary, C.A.; Jagannath, A.; Hankins, M.W.; Bannerman, D.M.; Lightman, S.L.; Vyazovskiy, V.V.; Nolan, P.M.; Foster, R.G.; Peirson, S.N. |
| Title |
Melanopsin Regulates Both Sleep-Promoting and Arousal-Promoting Responses to Light |
Type |
Journal Article |
| Year |
2016 |
Publication |
PLoS Biology |
Abbreviated Journal |
PLoS Biol |
| Volume |
14 |
Issue |
6 |
Pages |
e1002482 |
| Keywords |
Human health; melanopsin; sleep; circadian rhythm |
| Abstract |
Light plays a critical role in the regulation of numerous aspects of physiology and behaviour, including the entrainment of circadian rhythms and the regulation of sleep. These responses involve melanopsin (OPN4)-expressing photosensitive retinal ganglion cells (pRGCs) in addition to rods and cones. Nocturnal light exposure in rodents has been shown to result in rapid sleep induction, in which melanopsin plays a key role. However, studies have also shown that light exposure can result in elevated corticosterone, a response that is not compatible with sleep. To investigate these contradictory findings and to dissect the relative contribution of pRGCs and rods/cones, we assessed the effects of light of different wavelengths on behaviourally defined sleep. Here, we show that blue light (470 nm) causes behavioural arousal, elevating corticosterone and delaying sleep onset. By contrast, green light (530 nm) produces rapid sleep induction. Compared to wildtype mice, these responses are altered in melanopsin-deficient mice (Opn4-/-), resulting in enhanced sleep in response to blue light but delayed sleep induction in response to green or white light. We go on to show that blue light evokes higher Fos induction in the SCN compared to the sleep-promoting ventrolateral preoptic area (VLPO), whereas green light produced greater responses in the VLPO. Collectively, our data demonstrates that nocturnal light exposure can have either an arousal- or sleep-promoting effect, and that these responses are melanopsin-mediated via different neural pathways with different spectral sensitivities. These findings raise important questions relating to how artificial light may alter behaviour in both the work and domestic setting. |
| Address |
Sleep and Circadian Neuroscience Institute (SCNi), Nuffield Department of Clinical Neurosciences, Oxford Molecular Pathology Institute, Dunn School of Pathology, University of Oxford, Oxford, United Kingdom; stuart.peirson(at)eye.ox.ac.uk (SNP); russell.foster(at)eye.ox.ac.uk (RGF). |
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PLOS |
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| Language |
English |
Summary Language |
English |
Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
1544-9173 |
ISBN |
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| Notes |
PMID:27276063; PMCID:PMC4898879 |
Approved |
no |
| Call Number |
IDA @ john @ |
Serial |
1490 |
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| Author |
Escobar, C.; Salgado-Delgado, R.; Gonzalez-Guerra, E.; Tapia Osorio, A.; Angeles-Castellanos, M.; Buijs, R.M. |
| Title |
Circadian disruption leads to loss of homeostasis and disease |
Type |
Journal Article |
| Year |
2011 |
Publication |
Sleep Disorders |
Abbreviated Journal |
Sleep Disord |
| Volume |
2011 |
Issue |
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Pages |
964510 |
| Keywords |
Human Health |
| Abstract |
The relevance of a synchronized temporal order for adaptation and homeostasis is discussed in this review. We present evidence suggesting that an altered temporal order between the biological clock and external temporal signals leads to disease. Evidence mainly based on a rodent model of “night work” using forced activity during the sleep phase suggests that altered activity and feeding schedules, out of phase from the light/dark cycle, may be the main cause for the loss of circadian synchrony and disease. It is proposed that by avoiding food intake during sleep hours the circadian misalignment and adverse consequences can be prevented. This review does not attempt to present a thorough revision of the literature, but instead it aims to highlight the association between circadian disruption and disease with special emphasis on the contribution of feeding schedules in circadian synchrony. |
| Address |
Departamento de Anatomia, Facultad de Medicina, Universidad Nacional Autonoma de Mexico, 04360 Mexico City, DF, Mexico |
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English |
Summary Language |
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Series Issue |
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Edition |
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| ISSN |
2090-3553 |
ISBN |
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| Notes |
PMID:23471148; PMCID:PMC3581131 |
Approved |
no |
| Call Number |
LoNNe @ kagoburian @ |
Serial |
745 |
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| Author |
Salgado-Delgado, R.; Tapia Osorio, A.; Saderi, N.; Escobar, C. |
| Title |
Disruption of circadian rhythms: a crucial factor in the etiology of depression |
Type |
Journal Article |
| Year |
2011 |
Publication |
Depression Research and Treatment |
Abbreviated Journal |
Depress Res Treat |
| Volume |
2011 |
Issue |
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Pages |
839743 |
| Keywords |
Human Health |
| Abstract |
Circadian factors might play a crucial role in the etiology of depression. It has been demonstrated that the disruption of circadian rhythms by lighting conditions and lifestyle predisposes individuals to a wide range of mood disorders, including impulsivity, mania and depression. Also, associated with depression, there is the impairment of circadian rhythmicity of behavioral, endocrine, and metabolic functions. Inspite of this close relationship between both processes, the complex relationship between the biological clock and the incidence of depressive symptoms is far from being understood. The efficiency and the timing of treatments based on chronotherapy (e.g., light treatment, sleep deprivation, and scheduled medication) indicate that the circadian system is an essential target in the therapy of depression. The aim of the present review is to analyze the biological and clinical data that link depression with the disruption of circadian rhythms, emphasizing the contribution of circadian desynchrony. Therefore, we examine the conditions that may lead to circadian disruption of physiology and behavior as described in depressive states, and, according to this approach, we discuss therapeutic strategies aimed at treating the circadian system and depression. |
| Address |
Departamento de Biologia Celular y Fisiologia, Instituto de Investigaciones Biomedicas, Universidad Nacional Autonoma de Mexico, 04306 Mexico, DF, Mexico |
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English |
Summary Language |
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Edition |
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| ISSN |
2090-1321 |
ISBN |
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| Notes |
PMID:21845223; PMCID:PMC3154570 |
Approved |
no |
| Call Number |
LoNNe @ christopher.kyba @ |
Serial |
524 |
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