Last updated July 11, 2026
Key finding
PSQI scores decreased significantly from baseline.
This study evaluated the impact of light therapy on sleep quality and circadian rhythm in older adults with type 2 diabetes, finding significant improvements in sleep quality.
Quick read
The essential study design details in one scan.
EvidenceScore™
Moderate
Study type
RCTs
Follow-up
Short-Term (≤3 mo)
Risk of bias
Some Concerns
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Plain-language summary
A plain-language read of the study’s main message and where it applies.
Study focus
This study evaluated the impact of light therapy on sleep quality and circadian rhythm in older adults with type 2 diabetes, finding significant improvements in sleep quality.
Improving sleep quality is crucial for older adults, particularly those with type 2 diabetes, as it can enhance overall health and well-being. This study suggests that light therapy could be a viable non-pharmacological intervention to address sleep disturbances in this population.
The study's sample size may limit generalizability. The control group showed no significant changes, raising questions about the intervention's effectiveness. The study did not account for potential confounding factors affecting sleep quality.
Published in
Publication details and source links for this paper.
Qin W, Shuang W, Zhenhua L, et al. Light Therapy Improves Sleep Quality and Circadian Rhythm in Older Adults with Type 2 Diabetes. Frontiers in Endocrinology. 2024;15:1307537. doi:10.3389/fendo.2024.1307537
PSQI scores decreased significantly by 4.5 points in the light therapy group (p=0.001).
MEQ scores decreased significantly by 4.85 points in the light therapy group (p=0.001).
No significant difference in GSP values between groups at T1 and T2.
Evidence network
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This study contributes evidence to Photobiomodulation therapy and Glycated serum protein (GSP) levels, Morningness-Eveningness Questionnaire (MEQ) score, Sleep quality.
This study contributes evidence to
Primary intervention
Photobiomodulation therapy
Primary outcomes
Evidence topics
Primary intervention
Intervention and outcome relationships this study adds to the evidence network.
Editorial context
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Evidence network role
This section describes how the study fits into the current evidence network. It does not determine whether an intervention works on its own.
1
Related topics
3
Evidence pairs
128
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Evidence topic
Contributes evidence
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Primary evidence
Evidence topic
matched_outcome
Core evidence
The primary outcomes reported in this study.
Photobiomodulation therapy → Glycated serum protein (GSP) levels
Photobiomodulation therapy → Glycated serum protein (GSP) levels
Photobiomodulation therapy → Morningness-Eveningness Questionnaire (MEQ) score
Photobiomodulation therapy → Morningness-Eveningness Questionnaire (MEQ) score
Evidence Library
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Relationships organized using the Dediabetes Evidence Intelligence™ framework.
This study contributes to evidence on Photobiomodulation therapy and Glycated serum protein (GSP) levels, Photobiomodulation therapy and Morningness-Eveningness Questionnaire (MEQ) score.
This study contributes to the evidence on the following intervention-outcome relationships.
Curated evidence collections and hubs this study is part of.
All studies measuring Glycated serum protein (GSP) levels
Measures Glycated serum protein (GSP) levels as a key outcome.
All studies measuring Morningness-Eveningness Questionnaire (MEQ) score
Measures Morningness-Eveningness Questionnaire (MEQ) score as a key outcome.
All studies on Photobiomodulation therapy
Contributes to Photobiomodulation therapy evidence base.
All studies measuring Quality of Life Outcomes
Measures Quality of Life Outcomes as a key outcome.
Latest published studies
Published within the last 2 years.
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1 results
1 results
1 results
1 results
1 results
Generated from the study's connected evidence using Evidence Intelligence™.
Photobiomodulation therapy appears to improve morningness-eveningness questionnaire (MEQ) score.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Morningness-Eveningness Questionnaire (MEQ) score
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
Photobiomodulation therapy appears to improve sleep quality.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Sleep quality
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | strong positive | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
Current evidence does not show a clear benefit of Photobiomodulation therapy for glycated serum protein (GSP) levels.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Glycated serum protein (GSP) levels
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | neutral | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
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