Bedroom Light Exposure at Night and the Incidence of Depressive Symptoms: A Longitudinal Study of the HEIJO-KYO Cohort

53Citations
Citations of this article
129Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

Previous studies have indicated that minimal exposure to light at night (LAN) increases depression risk, even at 5 lux, in nocturnal and diurnal mammals. Although such low-level LAN may affect human circadian physiology, the association between exposure to LAN and depressive symptoms remains uncertain. In the present study, bedroom light intensity was measured objectively, and depressive symptoms were assessed, during 2010-2014 in Nara, Japan. Of 863 participants (mean age = 71.5 years) who did not have depressive symptoms at baseline, 73 participants reported development of depressive symptoms during follow-up (median, 24 months). Compared with the "dark" group (average of <5 lux; n = 710), the LAN group (average of ≥5 lux; n = 153) exhibited a significantly higher depression risk (hazard ratio = 1.89; 95% CI: 1.13, 3.14), according to a Cox proportional hazards model adjusting for age, sex, body mass index, and economic status. Further, the significance remained in a multivariable model adjusting for hypertension, diabetes, and sleep parameters (hazard ratio = 1.72; 95% CI: 1.03, 2.89). Sensitivity analyses using bedroom light data with a cutoff value of ≥10 lux suggested consistent results. In conclusion, these results indicated that exposure to LAN in home settings was independently associated with subsequent depression risk in an elderly general population.

References Powered by Scopus

The Pittsburgh sleep quality index: A new instrument for psychiatric practice and research

24685Citations
N/AReaders
Get full text

International physical activity questionnaire: 12-Country reliability and validity

15104Citations
N/AReaders
Get full text

Generalized Additive Models: An Introduction with R

6536Citations
N/AReaders
Get full text

Cited by Powered by Scopus

Chronotype and Mental Health: Recent Advances

192Citations
N/AReaders
Get full text

Circadian disruption: What do we actually mean?

183Citations
N/AReaders
Get full text

Association of Outdoor Artificial Light at Night with Mental Disorders and Sleep Patterns among US Adolescents

145Citations
N/AReaders
Get full text

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Cite

CITATION STYLE

APA

Obayashi, K., Saeki, K., & Kurumatani, N. (2018). Bedroom Light Exposure at Night and the Incidence of Depressive Symptoms: A Longitudinal Study of the HEIJO-KYO Cohort. American Journal of Epidemiology, 187(3), 427–434. https://doi.org/10.1093/aje/kwx290

Readers' Seniority

Tooltip

PhD / Post grad / Masters / Doc 31

56%

Researcher 18

33%

Professor / Associate Prof. 3

5%

Lecturer / Post doc 3

5%

Readers' Discipline

Tooltip

Medicine and Dentistry 17

43%

Engineering 9

23%

Neuroscience 7

18%

Psychology 7

18%

Article Metrics

Tooltip
Mentions
Blog Mentions: 2
News Mentions: 20
Social Media
Shares, Likes & Comments: 422

Save time finding and organizing research with Mendeley

Sign up for free