Summary
A two-week morning light therapy protocol (6000 K, 380 lux, 480 nm, ≥25 min before 9:00 am) significantly improved daytime sleepiness, insomnia severity, and sleep quality within the treatment group, with daytime sleepiness showing a statistically significant between-group difference. These findings support morning bright light therapy as a practical adjunctive intervention for patients with sleep disorders, though larger controlled trials are needed to confirm efficacy.
Key Findings
- Epworth Sleepiness Scale (ESS) change was significantly different between groups: control mean change -0.14 vs. LT mean change -1.43 (p=0.021)
- Insomnia Severity Index and Pittsburgh Sleep Quality Index improved significantly within the LT group over two weeks, but not significantly versus control after baseline adjustment
- No significant differences in serum cortisol levels or clock gene expression were detected between groups
- Light therapy parameters: 6000 K, 380 lux, peak wavelength 480 nm, minimum 25 minutes daily before 9:00 am for 14 days
- Small pilot sample (n=14, 1:1 randomization) limits generalizability; results are preliminary
Categories
Sleep & Circadian Health: Evaluates morning bright light therapy on sleep quality, insomnia severity, and daytime sleepiness in patients with sleep disorders.
Mood & Mental Wellness: Self-reported mood parameters were assessed as secondary outcomes in the light therapy intervention.
Author(s)
J Yoon, SJ Heo, H Lee, EG Sul, TH Han, YJ Kwon
Publication Year
2023
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