Indoor Exposure to Natural Bright Light Prevents Afternoon Sleepiness

Kaida, Kosuke; Takahashi, Masaya; Haratani, Takashi; Otsuka, Yasumasa; Fukasawa, Kenji; Nakata, Akinori

doi:10.1093/sleep/29.4.462

Cited by 74 publications

(77 citation statements)

References 53 publications

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“…A short nap also improved dimensions of positive mood status, "pleasantness", "satisfaction", and "relaxation", and reduced subjective sleepiness. These results are compatible with our previous report 28) , which demonstrated that bright light exposure and a short nap improved the electrophysiological arousal level. The results suggest that these two interventions could improve mood status and arousal level.…”

Section: Discussionsupporting

confidence: 94%

“…We hypothesized that (1) a short nap would not only reduce subjective sleepiness and fatigue but also shift the mood status to the positive/ favorable side, and that (2) bright light would reduce subjective sleepiness and fatigue and also increase positive mood status during the exposure. Some of the results of the present study, those which examine the effects on the physiologic arousal level, have already been reported 28) .…”

Section: Introductionmentioning

confidence: 56%

“…The time schedule of the series of tasks was 10 min for the PVT, 1 min each for the Karolinska sleepiness scale 33) , VAS, and MCL-3, 7 min for the KDT, 8 min for the AAT, with 4 min for rest (total: 30 min). The detailed experimental schedule and results, except VAS and MCL-3, reported in other publications 28,36) .…”

Section: Methodsmentioning

confidence: 99%

“…The study 28) involved one preparatory day and three experimental days. The preparatory day was used for practicing and making participants accustomed to the experimental circumstances.…”

Section: Participants and Designmentioning

confidence: 99%

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A Short Nap and Natural Bright Light Exposure Improve Positive Mood Status

2007

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While the effects of a short nap on performance and arousal level have been well investigated, less attention has been paid to its effects on mood status. The aim of the present study was to examine the effects of a short nap and natural bright light exposure on mood status. Participants were 16 healthy females who were on average 38.1 (SD = 2.68) yr old. From 11:00 to 12:00, the participants carried out a set of tasks twice with baseline lighting (<100 lux). From 12:40 to 13:10, they were subjected to three experimental conditions: control (<100 lux), natural bright light (>2,000 lux), and a 20-min nap. From 13:10 to 16:10, the tasks were repeated six times with the baseline lighting. To measure mood status, multiple visual analogue scales (to measure anxiety, sadness, anger, confusion, apathy, fatigue, and sleepiness) and the Mood Check List 3 (MCL-3) (to derive "pleasantness", "satisfaction" and "relaxation") were employed. The results showed that brief (30 min) natural bright light exposure improved one dimension of mood status, "pleasantness". A short nap also improved dimensions of mood status ("pleasantness", "satisfaction", and "relaxation"). These results suggest that the proper application of both natural light and a short nap shifts the mood status to the positive/favorable side.

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Section: Discussionsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 56%

Section: Methodsmentioning

confidence: 99%

“…The study 28) involved one preparatory day and three experimental days. The preparatory day was used for practicing and making participants accustomed to the experimental circumstances.…”

Section: Participants and Designmentioning

confidence: 99%

See 2 more Smart Citations

A Short Nap and Natural Bright Light Exposure Improve Positive Mood Status

2007

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“…Moreover, studies also revealed changes in brainrelated indicators of arousal and alertness under bright versus dim light exposure, for example increases in hemodynamic activity in the Locus Coeruleus [6] and changes in electroencephalographic (EEG ) theta and alpha power density [23][24][25]. In these studies, physiological arousal levels were either measured during cognitive task performance [6,17,21,22] or in rest (sitting or lying down) with eyes open or closed [19,20,[23][24][25].…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Non-image forming effects of illuminance level: Exploring parallel effects on physiological arousal and task performance

Huiberts

Smolders

Kort

2016

Physiology & Behavior

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This study investigated diurnal non-image forming (NIF) effects of illuminance level on physiological arousal in parallel to NIF effects on vigilance and working memory performance. We employed a counterbalanced within-subjects design in which thirty-nine participants (mean age = 21.2; SD = 2.1; 11 male) completed three 90-minute sessions (165 vs. 600 lux vs. 1700 lux at eye level) either in the morning (N=18) or afternoon (N=21).During each session, participants completed four measurement blocks (incl. one baseline block) each consisting of a 10-minute Psychomotor Vigilance Task (PVT) and a Backwards Digit-Span Task (BDST) including easy trials (4-6 digits) and difficult trials (7-8 digits).Heart rate (HR), skin conductance level (SCL) and systolic blood pressure (SBP) were measured continuously.The results revealed a significant improvement on the BDST difficult trials under 1700 lux vs. 165 lux (p = 0.01), while illuminance level did not affect performance on the PVT and BDST easy trials. Illuminance level impacted HR and SCL, but not SBP. In the afternoon sessions, HR was significantly higher under 1700 lux vs. 165 lux during PVT performance (p = 0.05), while during BDST performance, HR was only slightly higher under 600 vs. 165 lux (p = 0.06). SCL was significantly higher under 1700 lux vs. 165 lux during performance on BDST easy trials (p = 0.02) and showed similar, but nonsignificant trends during the PVT and BDST difficult trials. Although both physiology and performance were affected by illuminance level, no consistent pattern emerged with respect to parallel changes in physiology and performance. Rather, physiology and performance seem to be affected independently, via unique pathways.

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Workplace lighting for improving alertness and mood in daytime workers

Pachito

Éckeli²,

Desouky³

et al. 2018

Cochrane Database of Systematic Reviews

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There is very low-quality evidence based on two CBA studies that high CCT light may improve alertness, but not mood, in daytime workers. There is very low-quality evidence based on one CBA study that high CCT light may also cause less irritability, eye discomfort and headache than standard illumination. There is low-quality evidence based on one RCT that different proportions of direct and indirect light in the workplace do not affect alertness or mood. There is very low-quality evidence based on one RCT that individually applied blue-enriched light improves both alertness and mood. There is low-quality evidence based on one RCT that individually administered bright light during the afternoon is as effective as morning exposure for improving alertness and mood in subsyndromal seasonal affective disorder.

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Indoor Exposure to Natural Bright Light Prevents Afternoon Sleepiness

Abstract: Brief indoor exposure to natural bright light may decrease afternoon sleepiness. This technique of light could be used in work settings in which napping is not permitted.

Cited by 74 publications

References 53 publications

A Short Nap and Natural Bright Light Exposure Improve Positive Mood Status

A Short Nap and Natural Bright Light Exposure Improve Positive Mood Status

Non-image forming effects of illuminance level: Exploring parallel effects on physiological arousal and task performance

Workplace lighting for improving alertness and mood in daytime workers

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