Summary
This systematic review and meta-analysis of 14 studies from 7 countries found that lighting interventions—particularly blue-enriched white light above 5000K—significantly reduced sleepiness in night-shift workers. Hospitals are advised to install blue-enriched white light systems for night-shift healthcare staff to improve alertness, patient safety, and job satisfaction.
Key Findings
- Lighting interventions significantly improved sleepiness in night-shift workers overall (SMDs with 95% CIs synthesized via random-effects model across 14 studies).
- Blue-enriched white light with color temperature greater than 5000K was specifically identified as effective for improving nighttime alertness in shift workers.
- Findings applied across 7 countries and included nursing populations, suggesting broad generalizability for healthcare settings.
- Practical outcomes linked to lighting improvements included reduced accident risk, improved work efficiency, and greater job satisfaction.
Categories
Shift Work & Staff Wellbeing: Systematic review and meta-analysis directly examining lighting interventions to reduce sleepiness in night-shift workers, including nurses.
Sleep & Circadian Health: Investigates how artificial light alters circadian rhythms and phase-shifts the biological clock in shift workers.
Workplace Performance: Links improved alertness from lighting interventions to patient safety, accident reduction, and work efficiency outcomes.
Author(s)
CJ Wu, TY Huang, SF Ou, JT Shiea, BO Lee
Publication Year
2022
Number of Citations
8
Related Publications
Shift Work & Staff Wellbeing
- Off the clock: from circadian disruption to metabolic disease
- Endocrine regulation of circadian physiology
- Working against the biological clock: a review for the Occupational Physician
- Shiftwork and light at night negatively impact molecular and endocrine timekeeping in the female reproductive axis in humans and rodents
- Circadian Rhythms Disrupted by Light at Night and Mistimed Food Intake Alter Hormonal Rhythms and Metabolism
Sleep & Circadian Health
- Phototransduction by retinal ganglion cells that set the circadian clock
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- The two‐process model of sleep regulation: a reappraisal
- Melanopsin is required for non-image-forming photic responses in blind mice
- Strange vision: ganglion cells as circadian photoreceptors
Workplace Performance
- Acute alerting effects of light: A systematic literature review
- Effects of artificial dawn and morning blue light on daytime cognitive performance, well-being, cortisol and melatonin levels
- Can light make us bright? Effects of light on cognition and sleep
- Kruithof's rule revisited using LED illumination
- Shining light on memory: Effects of bright light on working memory performance