Effect of reduced illumination on insomnia in office workers

Tomoaki Kozaki, Nobuhiko Miura, Masaya Takahashi, Akira Yasukouchi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Objective: We evaluated the possible effects of reduced illumination in the workplace on insomnia among office workers. Methods: Seventy-two office workers answered the Athens Insomnia Scale (AIS) in July 2009 (under ordinary illumination, OI conditions) and July 2010 (under reduced illumination, RI conditions). The workers were divided into three groups, indoor workers (IWs), semioutdoor workers (SWs) and outdoor workers (OWs), according to the frequency of working outside of the office because a worker with a high frequency of working outside of the office might rarely be exposed to the lighting condition within an office. The first five items of the AIS (AIS-5) were used to assess sleep difficulties, and the last three items (AIS-3) assessed next-day consequences of sleep or daytime symptoms, which often result from insomnia and/or sleep disorders. Results: Illuminance levels at a height of 1,100 mm from the floor under the RI conditions (550-490 lux) were significantly lower than under the OI conditions (750-700 lux). The AIS-5 score of the IWs was significantly increased under the RI conditions compared with the OI conditions. There was no difference in AIS-3 scores between conditions for any group. Conclusion: Indoor workers hardly went outside of the office and were exposed only to office light during the daytime. Thus, the underexposure to light could have had an impact on insomnia in those individuals. A novel lighting environment is required to optimize work-related levels of light exposure.

Original languageEnglish
Pages (from-to)331-335
Number of pages5
JournalJournal of Occupational Health
Volume54
Issue number4
DOIs
Publication statusPublished - Jan 1 2012

Fingerprint

Sleep Initiation and Maintenance Disorders
Lighting
Light
Sleep
Workplace

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health

Cite this

Effect of reduced illumination on insomnia in office workers. / Kozaki, Tomoaki; Miura, Nobuhiko; Takahashi, Masaya; Yasukouchi, Akira.

In: Journal of Occupational Health, Vol. 54, No. 4, 01.01.2012, p. 331-335.

Research output: Contribution to journalArticle

Kozaki, T, Miura, N, Takahashi, M & Yasukouchi, A 2012, 'Effect of reduced illumination on insomnia in office workers', Journal of Occupational Health, vol. 54, no. 4, pp. 331-335. https://doi.org/10.1539/joh.12-0049-FS
Kozaki, Tomoaki ; Miura, Nobuhiko ; Takahashi, Masaya ; Yasukouchi, Akira. / Effect of reduced illumination on insomnia in office workers. In: Journal of Occupational Health. 2012 ; Vol. 54, No. 4. pp. 331-335.
@article{ca7a6a2cc1004705965bf5c82fa131f9,
title = "Effect of reduced illumination on insomnia in office workers",
abstract = "Objective: We evaluated the possible effects of reduced illumination in the workplace on insomnia among office workers. Methods: Seventy-two office workers answered the Athens Insomnia Scale (AIS) in July 2009 (under ordinary illumination, OI conditions) and July 2010 (under reduced illumination, RI conditions). The workers were divided into three groups, indoor workers (IWs), semioutdoor workers (SWs) and outdoor workers (OWs), according to the frequency of working outside of the office because a worker with a high frequency of working outside of the office might rarely be exposed to the lighting condition within an office. The first five items of the AIS (AIS-5) were used to assess sleep difficulties, and the last three items (AIS-3) assessed next-day consequences of sleep or daytime symptoms, which often result from insomnia and/or sleep disorders. Results: Illuminance levels at a height of 1,100 mm from the floor under the RI conditions (550-490 lux) were significantly lower than under the OI conditions (750-700 lux). The AIS-5 score of the IWs was significantly increased under the RI conditions compared with the OI conditions. There was no difference in AIS-3 scores between conditions for any group. Conclusion: Indoor workers hardly went outside of the office and were exposed only to office light during the daytime. Thus, the underexposure to light could have had an impact on insomnia in those individuals. A novel lighting environment is required to optimize work-related levels of light exposure.",
author = "Tomoaki Kozaki and Nobuhiko Miura and Masaya Takahashi and Akira Yasukouchi",
year = "2012",
month = "1",
day = "1",
doi = "10.1539/joh.12-0049-FS",
language = "English",
volume = "54",
pages = "331--335",
journal = "Journal of Occupational Health",
issn = "1341-9145",
publisher = "Japan Society for Occupational Health",
number = "4",

}

TY - JOUR

T1 - Effect of reduced illumination on insomnia in office workers

AU - Kozaki, Tomoaki

AU - Miura, Nobuhiko

AU - Takahashi, Masaya

AU - Yasukouchi, Akira

PY - 2012/1/1

Y1 - 2012/1/1

N2 - Objective: We evaluated the possible effects of reduced illumination in the workplace on insomnia among office workers. Methods: Seventy-two office workers answered the Athens Insomnia Scale (AIS) in July 2009 (under ordinary illumination, OI conditions) and July 2010 (under reduced illumination, RI conditions). The workers were divided into three groups, indoor workers (IWs), semioutdoor workers (SWs) and outdoor workers (OWs), according to the frequency of working outside of the office because a worker with a high frequency of working outside of the office might rarely be exposed to the lighting condition within an office. The first five items of the AIS (AIS-5) were used to assess sleep difficulties, and the last three items (AIS-3) assessed next-day consequences of sleep or daytime symptoms, which often result from insomnia and/or sleep disorders. Results: Illuminance levels at a height of 1,100 mm from the floor under the RI conditions (550-490 lux) were significantly lower than under the OI conditions (750-700 lux). The AIS-5 score of the IWs was significantly increased under the RI conditions compared with the OI conditions. There was no difference in AIS-3 scores between conditions for any group. Conclusion: Indoor workers hardly went outside of the office and were exposed only to office light during the daytime. Thus, the underexposure to light could have had an impact on insomnia in those individuals. A novel lighting environment is required to optimize work-related levels of light exposure.

AB - Objective: We evaluated the possible effects of reduced illumination in the workplace on insomnia among office workers. Methods: Seventy-two office workers answered the Athens Insomnia Scale (AIS) in July 2009 (under ordinary illumination, OI conditions) and July 2010 (under reduced illumination, RI conditions). The workers were divided into three groups, indoor workers (IWs), semioutdoor workers (SWs) and outdoor workers (OWs), according to the frequency of working outside of the office because a worker with a high frequency of working outside of the office might rarely be exposed to the lighting condition within an office. The first five items of the AIS (AIS-5) were used to assess sleep difficulties, and the last three items (AIS-3) assessed next-day consequences of sleep or daytime symptoms, which often result from insomnia and/or sleep disorders. Results: Illuminance levels at a height of 1,100 mm from the floor under the RI conditions (550-490 lux) were significantly lower than under the OI conditions (750-700 lux). The AIS-5 score of the IWs was significantly increased under the RI conditions compared with the OI conditions. There was no difference in AIS-3 scores between conditions for any group. Conclusion: Indoor workers hardly went outside of the office and were exposed only to office light during the daytime. Thus, the underexposure to light could have had an impact on insomnia in those individuals. A novel lighting environment is required to optimize work-related levels of light exposure.

UR - http://www.scopus.com/inward/record.url?scp=84867347496&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84867347496&partnerID=8YFLogxK

U2 - 10.1539/joh.12-0049-FS

DO - 10.1539/joh.12-0049-FS

M3 - Article

C2 - 22673645

AN - SCOPUS:84867347496

VL - 54

SP - 331

EP - 335

JO - Journal of Occupational Health

JF - Journal of Occupational Health

SN - 1341-9145

IS - 4

ER -