ArticleSleep2023
Measuring light regularity: sleep regularity is associated with regularity of light exposure in adolescents.
Article in Sleep, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 29 papers, 1 of them a synthesis that pooled it.
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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.
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Who cites it
29 citing papers in PubMed, 1 synthesis or guideline pooled it, 48 citations in OpenAlex.
- Efficacy of blue-light blocking glasses on actigraphic sleep outcomes: a systematic review and meta-analysis of randomized controlled crossover trials.Frontiers in neurology · 2025Pooled it
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- Sleep and light ecologies of parents with young infants: descriptive findings from the SUNSHINE project.Npj biological timing and sleep · 2026Article
- Blunted light exposure amplitudes in patients with opioid use disorder.Npj biological timing and sleep · 2026Article
- The role of circadian disruption, sleep dysregulation, lifestyle factors, and metabolic reprogramming in the pathogenesis and progression of ovarian cancer.Journal of the National Cancer Center · 2026Review
- Health Related Quality of Life and Sleep Regularity Among Middle-Aged to Older Adults From the Community.Journal of sleep research · 2026Article
- Auxiliary data, quality assurance and quality control for wearable light loggers and optical radiation dosimeters.Npj biological timing and sleep · 2026Article
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- Naturalistic light exposure patterns in relation to medication status, mood symptoms, and chronotype.Npj biological timing and sleep · 2026Article
- Adolescent circadian sleep health: a review of multimodal assessment strategies and clinical implications.Frontiers in sleep · 2026Review
- Relationships between light exposure and aspects of cognitive function in everyday life.Communications psychology · 2025Article
- Multimodal Sleep Measurement and Alignment Analysis in Outpatients With Major Depressive Episode: Observational Study.JMIR mHealth and uHealth · 2025Observational
- Sex and Seasonal Variations in Melatonin Suppression and Alerting Response to Light.Journal of the Endocrine Society · 2025Article
- How to Deal With Darkness: Modeling and Visualization of Zero-Inflated Personal Light Exposure Data on a Logarithmic Scale.Journal of biological rhythms · 2025Article
- Article
- Article
- Afternoon to early evening bright light exposure reduces later melatonin production in adolescents.Npj biological timing and sleep · 2025Article
- Sleep irregularity is associated with night-time technology, dysfunctional sleep beliefs and subjective sleep parameters amongst female university students.Scientific reports · 2025Article
- Wearables in Chronomedicine and Interpretation of Circadian Health.Diagnostics (Basel, Switzerland) · 2025Review
- Article
Corrections and comments
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Authors and funding
7 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
STUDY
objectivesLight is the main time cue for the human circadian system. Sleep and light are intrinsically linked; light exposure patterns can influence sleep patterns and sleep can influence light exposure patterns. However, metrics for quantifying light regularity are lacking, and the relationship between sleep and light regularity is underexplored. We developed new metrics for light regularity and demonstrated their utility in adolescents, across school term and vacation.
methodsDaily sleep/wake and light patterns were measured using wrist actigraphy in 75 adolescents (54% male, 17.17 ± 0.83 years) over 2 weeks of school term and a subsequent 2-week vacation. The Sleep Regularity Index (SRI) and social jetlag were computed for each 2-week block. Light regularity was assessed using (1) variation in mean daily light timing (MLiT); (2) variation in daily photoperiod; and (3) the Light Regularity Index (LRI). Associations between SRI and each light regularity metric were examined, and within-individual changes in metrics were examined between school and vacation.
resultsHigher SRI was significantly associated with more regular LRI scores during both school and vacation. There were no significant associations of SRI with variation in MLiT or daily photoperiod. Compared to school term, all three light regularity metrics were less variable during the vacation.
conclusionsLight regularity is a multidimensional construct, which until now has not been formally defined. Irregular sleep patterns are associated with lower LRI, indicating that irregular sleepers also have irregular light inputs to the circadian system, which likely contributes to circadian disruption.
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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.