The effect of evening light on circadian-related outcomes: A systematic review

Cyr, Mariève; Artenie, Despina Z.; Bikaii, Alain Al; Borsook, David; Olson, Jay A.

doi:10.1016/j.smrv.2022.101660

Cited by 12 publications

(13 citation statements)

References 67 publications

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“…Overall, our replicated findings are consistent with studies showing that circadian-based interventions using light exposure can improve cognitive performance, sleep, and mood, as well as reduce fatigue and work errors. 9,10,20,42 In contrast, some of our results were inconsistent with our earlier findings. We previously saw no change in sleepiness; 21 in our current study, both interventions reduced sleepiness by a small amount (around half a unit).…”

Section: Discussioncontrasting

confidence: 99%

“…Because it occurs closer to the body's expected daylight times, evening light may have fewer negative effects than light at night. 20 Interventions aiming to temporarily improve circadian misalignment in rapidly rotating shift workers may carry unknown risks due to the back and forth shifting of the circadian phase. 6 Here, while evening light reduced fatigue on work days, we did not see evidence of increased fatigue during days off.…”

Section: Discussionmentioning

confidence: 99%

“…18,19 Further, its implementation is limited by feasibility; optimising the timing of the light exposure requires precise knowledge of one's circadian phase, and using light during the night shift requires institutional cooperation. 20 Here, we propose evening bright light as a more feasible alternative to night-time light exposure.…”

Section: Introductionmentioning

confidence: 99%

“…In a recent systematic review, we found preliminary evidence that evening light can improve sleep-related outcomes, work performance, and adaptation to night shifts. 20 Similarly, we previously conducted a feasibility study to assess the effects of a combined intervention using evening light exposure, morning light avoidance, and scheduled sleep times. 21 In a within-subjects design with 33 nurses, we saw reductions in fatigue and work-related errors as well as improvements in mood and sleep.…”

Section: Introductionmentioning

confidence: 99%

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Evening light reduces fatigue and errors during night shifts: A randomised controlled trial

Cyr¹,

Artenie²,

Bikaii³

et al. 2022

Preprint

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Objective: Shift work causes circadian rhythms to misalign with the demands of the environment, which has been associated with sleep difficulties and cognitive impairments. Although bright light exposure during night shifts can improve circadian alignment, its implementation is often infeasible. Here, we tested whether light exposure in the evening, before the night shift, could improve fatigue, work performance, mood, and sleep. Methods: Fifty-seven healthy nurses who worked full-time rapidly rotating shift schedules completed the study. In a mixed-design randomised controlled trial, participants completed a baseline observation period before following one of two interventions. The experimental intervention aimed to improve circadian alignment using evening light exposure and morning light avoidance; the control intervention aimed to improve alertness and reduce sleep disturbances by modifying diet. Every morning and evening for 30 days, participants completed measures of fatigue, work-related errors, sleepiness, mood, sleep duration, and sleep quality. Results: Compared to the baseline observation period, the experimental intervention reduced errors by 67% while the control intervention reduced them by only 5%. This reduction was partially mediated by fatigue; experimental participants reported less fatigue on work days than control participants (d = 0.25 [0.12, 0.38]). The experimental group also showed a small improvement in mood. Both groups showed reductions in fatigue (d = .29 [.20, .35]) and sleepiness (d = 0.21 [0.13, 0.29]) as well as a small increase in sleep duration. Conclusion: Interventions based on evening light may thus be a feasible and effective strategy to reduce fatigue and errors in night shift workers.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evening light reduces fatigue and errors during night shifts: A randomised controlled trial

Cyr¹,

Artenie²,

Bikaii³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…With regard to future applications in the field, it should also be mentioned that late-evening light exposure can induce circadian phase delays and hence cause adverse effects, such as reduced sleep quality at home and increased sleepiness on the following morning [ 70 ]. However, to date there is only limited knowledge available regarding the effects of evening light exposure, especially for shift work [ 71 ]. Additional empirical research, both under strictly controlled conditions and in the field, is necessary to design NIF-effective automotive interior lighting.…”

Section: Discussionmentioning

confidence: 99%

Impact of Evening Light Exposures with Different Solid Angles on Circadian Melatonin Rhythms, Alertness, and Visual Comfort in an Automotive Setting

et al. 2022

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Future automotive interior lighting might have the potential to go beyond decorative purposes by influencing alertness, circadian physiology, and sleep. As the available space in the interior of an automobile for lighting applications is limited, understanding the impact of various luminous surface sizes on non-image-forming effects is fundamental in this field. In a laboratory study using a within-subject design, 18 participants were exposed to two bright light conditions with different solid angles and one dim light condition in a balanced, randomized order during the course of the evening. Our results demonstrate that both light conditions significantly increased subjective alertness and reduced salivary melatonin concentration but not cognitive performance compared to dim light. The solid angle of light exposure at constant corneal illuminance only affected visual comfort. While subjective alertness can be increased and melatonin can be attenuated with rather small luminaires, larger solid angles should be considered if visual comfort is a priority.

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Melatonin Alters Preference to Move Toward Monochromatic Lights in Female Syrian Hamsters: A Behavior Associated With Circadian Rhythm

Shadman

2024

J Exp Zool Pt A

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Different light colors have different effects on endogenous melatonin. The preference for light colors has been studied in various animal species, except hamsters. Additionally, no research has been done on how melatonin affects color preference. In this study, I investigated whether melatonin can influence Syrian hamsters' preferences for various light colors. Eighteen female Syrian hamsters were divided into a control group and a test group orally administered 0.01 mg melatonin daily for 30 days. On Day 31, I placed each hamster in the test box at four stages: dark mid‐phase; beginning, middle, and end of day. The box had four areas with red, yellow, green, and blue lamps. In each stage, the hamsters' movements were recorded for 5 min. I tested the effects of color, stage, and melatonin treatment using a mixed model analysis. The preferences of both groups changed between the stages (p < 0.001) with the except stages 1 and 4 of the control group (p = 0.012); and stages 2 and 3 of the test group for the yellow color (p = 0.104). There was a significant difference between the test and the control groups in all stages and all colors (p < 0.001) except the green light color in stage 2 (p = 0.007). The results suggest that exogenous melatonin controls the preference for monochromatic light by an unknown mechanism. Circadian endogenous melatonin levels are also effective. Scientists must consider melatonin levels in studies evaluating responses to light.

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The effect of evening light on circadian-related outcomes: A systematic review

Cited by 12 publications

References 67 publications

Evening light reduces fatigue and errors during night shifts: A randomised controlled trial

Evening light reduces fatigue and errors during night shifts: A randomised controlled trial

Impact of Evening Light Exposures with Different Solid Angles on Circadian Melatonin Rhythms, Alertness, and Visual Comfort in an Automotive Setting

Melatonin Alters Preference to Move Toward Monochromatic Lights in Female Syrian Hamsters: A Behavior Associated With Circadian Rhythm

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