Trial reportSleep medicine2011
Effectiveness of evening phototherapy for insomnia is reduced by bright daytime light exposure.
Trial report in Sleep medicine, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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
15 citing papers in PubMed, 42 citations in OpenAlex.
- Early evening light mitigates sleep compromising physiological and alerting responses to subsequent late evening light.Scientific reports · 2019Trial
- From Sunlight to Screens: Modeling When Light Exposure Matters Most for Sleep and Circadian Health.Clocks & sleep · 2026Article
- Pupillometric and perceptual approaches provide independent estimates of melanopsin activity in humans.Sleep · 2025Article
- Recommendations for daytime, evening, and nighttime indoor light exposure to best support physiology, sleep, and wakefulness in healthy adults.PLoS biology · 2022Article
- Current Insights into Optimal Lighting for Promoting Sleep and Circadian Health: Brighter Days and the Importance of Sunlight in the Built Environment.Nature and science of sleep · 2022Review
- The interindividual variability of sleep timing and circadian phase in humans is influenced by daytime and evening light conditions.Scientific reports · 2021Article
- Good Places to Live and Sleep Well: A Literature Review About the Role of Architecture in Determining Non-Visual Effects of Light.International journal of environmental research and public health · 2021Review
- Human-Centric Lighting: Foundational Considerations and a Five-Step Design Process.Frontiers in neurology · 2021Review
- Naturalistic Intensities of Light at Night: A Review of the Potent Effects of Very Dim Light on Circadian Responses and Considerations for Translational Research.Frontiers in neurology · 2021Review
- The Lighting Environment, Its Metrology, and Non-visual Responses.Frontiers in neurology · 2021Article
- Assessing Chronotypes by Ambulatory Circadian Monitoring.Frontiers in physiology · 2019Article
- Differential impact in young and older individuals of blue-enriched white light on circadian physiology and alertness during sustained wakefulness.Scientific reports · 2017Article
- Real life trumps laboratory in matters of public health.Proceedings of the National Academy of Sciences of the United States of America · 2015Article
- Nocturia reported in nightly sleep diaries: common occurrence with significant implications?Health psychology : official journal of the Division of Health Psychology, American Psychological Association · 2014Article
- Low-intensity treadmill exercise and/or bright light promote neurogenesis in adult rat brain.Neural regeneration research · 2013Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 2 institutions in 1 country.
Funding
Abstract
objectiveTo examine the effect of ambulatory daytime light exposure on phase delays and on the advances produced by timed exposure to bright evening or morning light.
methodsAs a subset of a larger study, 32 older (63.0 ± 6.43 years) adults with primary insomnia were randomized to an at-home, single-blind, 12-week, parallel-group study entailing daily exposure to 45 min of scheduled evening or morning bright (∼4000 lux) light. Light exposure patterns during the baseline and the last week of treatment were monitored using actigraphs with built-in illuminance detectors. Circadian phase was determined through analysis of in-laboratory collected plasma melatonin.
resultsLess daytime light exposure during the last week of treatment was significantly associated with larger phase delays in response to evening light (r's>0.78). Less daytime light exposure during the last week of treatment was also associated with a significant delay in wake time (r's>-0.75). There were no such relationships between light exposure history and phase advances in response to morning light.
conclusionsGreater light exposure during the daytime may decrease the ability of evening light, but not morning light, exposure to engender meaningful changes of circadian phase.
Indexed as
Identifiers
What OpenQuestion holds
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.