ArticleAmerican journal of epidemiology2018
Bedroom Light Exposure at Night and the Incidence of Depressive Symptoms: A Longitudinal Study of the HEIJO-KYO Cohort.
Article in American journal of epidemiology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers, 4 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
26 citing papers in PubMed, 4 syntheses or guidelines pooled it.
- Light at night exposure and risk of depression: a meta-analysis of observational studies.Journal of global health · 2025Pooled it
- Incidence of depression among community-dwelling older adults: A systematic review.Psychogeriatrics : the official journal of the Japanese Psychogeriatric Society · 2024Pooled it
- Artificial light at night and risk of depression: a systematic review and meta-analysis.Environmental health and preventive medicine · 2024Pooled it
- Lighting in the Home and Health: A Systematic Review.International journal of environmental research and public health · 2021Pooled it
- Blue Light Exposure During Sleep in Type 1 Diabetes: Impacts on Glycemic Control and Psychosocial Health.Journal of sleep research · 2026Trial
- The Light-Eye-Brain Axis: Neurobiological Links Between Mood Disorders and Myopia-A Narrative Review.Ophthalmology and therapy · 2026Review
- Artificial outdoor light at night and depression in older adults in the USA, England, Northern Ireland, and Ireland.Environment international · 2025Article
- The association between using screen in the dark and depressive symptoms: a longitudinal study among Chinese adolescents.Frontiers in psychiatry · 2025Article
- Lower regional urbanicity and socioeconomic status attenuate associations of green spaces with hypertension and diabetes mellitus: a national representative cross-sectional study in China.Environmental health and preventive medicine · 2024Article
- Sleep, light exposure at night, and psychological wellbeing during pregnancy.BMC public health · 2023Article
- Multidimensional Environmental Factors and Sleep Health for Aging Adults: A Focused Narrative Review.International journal of environmental research and public health · 2022Review
- Article
- Nighttime Light Hurts Mammalian Physiology: What Diurnal Rodent Models Are Telling Us.Clocks & sleep · 2021Review
- The impact of image resolution on power, bias, and confounding: A simulation study of ambient light at night exposure.Environmental epidemiology (Philadelphia, Pa.) · 2021Article
- Disruptions of Circadian Rhythms and Thrombolytic Therapy During Ischemic Stroke Intervention.Frontiers in neuroscience · 2021Review
- Circadian Strain, Light Exposure, and Depressive Symptoms in Rural Communities of Southern Brazil.Frontiers in network physiology · 2021Article
- Development and validation of nutrient estimates based on a food-photographic record in Japan.Nutrition journal · 2020Article
- Daily and Seasonal Variation in Light Exposure among the Old Order Amish.International journal of environmental research and public health · 2020Article
- Population-Based Approaches to Mental Health: History, Strategies, and Evidence.Annual review of public health · 2020Review
- Circadian disruption: What do we actually mean?The European journal of neuroscience · 2020Review
Corrections and comments
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
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.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.