SynthesisSleep health2019
A systematic review of the amount and timing of light in association with objective and subjective sleep outcomes in community-dwelling adults.
Synthesis in Sleep health, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers, 3 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
33 citing papers in PubMed, 3 syntheses or guidelines pooled it.
- Walking and subjective sleep quality in adults: a Bayesian three-level meta-analysis with probabilistic clinical relevance assessment and dose-response modeling.Frontiers in public health · 2026Pooled it
- Determinants of natural adult sleep: An umbrella review.PloS one · 2022Pooled it
- Lighting in the Home and Health: A Systematic Review.International journal of environmental research and public health · 2021Pooled it
- Effects of light therapy on sleep and circadian rhythm in older type 2 diabetics living in long-term care facilities: a randomized controlled trial.Frontiers in endocrinology · 2024Trial
- Impact of repeated morning bright white light exposures on attention in a simulated office environment.Scientific reports · 2023Trial
- Daily associations between the physical environment and sleep among a diverse, national sample of young adults.Sleep health · 2026Article
- Evaluating chest-worn light logger adherence: development and application of a wear/non-wear model.Scientific reports · 2026Article
- Antioxidant Supplementation ReducesCurrent developments in nutrition · 2026Article
- Article
- Outdoor night light exposure and sleep structure, a panel study using consumer-grade wearables.BMC public health · 2026Article
- Health of teleworkers: a scoping review on the assessment of the work-from-home environment.Journal of occupational health · 2026Article
- Associated factors and a risk prediction model for comorbid circadian rhythm sleep-wake disorders in patients with chronic fatigue syndrome: implications for early screening and sleep health management.Frontiers in psychiatry · 2026Article
- Circadian-immune crosstalk in insomnia disorder: mechanisms and therapeutic implications.Frontiers in neuroscience · 2026Review
- Individual-Level Exposure to Light at Night and Sleep Health: A Comparison between Real-Time Mobility-Based Measurements and Indoor Residence-Based Measurements.Environmental science & technology · 2025Article
- Identifying chest-worn light logger adherence: a validation study.medRxiv : the preprint server for health sciences · 2025Article
- Pilot study of dynamic lighting and sleep consolidation among older adults in a Jordanian senior care facility.Scientific reports · 2025Article
- Characteristics of objectively-measured naturalistic light exposure patterns in U.S. adults: A cross-sectional analysis of two cohorts.The Science of the total environment · 2025Article
- Light levels in a modern intensive care unit: Impact of time of year, window directionality, and outdoor light levels.Chronobiology international · 2025Article
- Daily light exposure habits of youth with migraine: a prospective exploratory study.Npj biological timing and sleep · 2025Article
- Role of visual and non-visual opsins in blue light-induced neurodegeneration inFrontiers in public health · 2025Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
10 authors.
Funding
Abstract
Light is considered the dominant environmental cue, or zeitgeber, influencing the sleep-wake cycle. Despite recognizing the importance of light for our well-being, less is known about the specific conditions under which light is optimally associated with better sleep. Therefore, a systematic review was conducted to examine the association between the amount and timing of light exposure in relation to sleep outcomes in healthy, community-dwelling adults. A systematic search was conducted of four databases from database inception to June 2016. In total, 45 studies met the review eligibility criteria with generally high study quality excepting for the specification of eligibility criteria and the justification of sample size. The majority of studies involved experimental manipulation of light (n = 32) vs observational designs (n = 13). Broad trends emerged suggesting that (1) bright light (>1000 lux) has positive implications for objectively assessed sleep outcomes compared to dim (<100 lux) and moderate light (100-1000 lux) and (2) bright light (>1000 lux) has positive implications for subjectively assessed sleep outcomes compared to moderate light (100-1000 lux). Effects due to the amount of light are moderated by the timing of light exposure such that, for objectively assessed sleep outcomes, brighter morning and evening light exposure are consistent with a shift in the timing of the sleep period to earlier and later in the day, respectively. For subjectively assessed sleep outcomes, brighter light delivered in the morning was associated with self-reported sleep improvements and brighter evening light exposure was associated with worse self-reported sleep.
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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.