Grade B
Rct
Blue Light Exposure and Melatonin Suppression: Dose-Response Study
Controlled study examining blue light wavelength and intensity effects on melatonin secretion and circadian phase shifting.
Published 2024
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[STUDY DETAILS]
- Study Type
- Rct
- Quality Grade
- B
- Publication Year
- 2024
- Category
- Sleep & Recovery
Summary
Crossover study (n=48) found 2-hour evening exposure to 450-480nm blue light suppressed melatonin by 55% and delayed circadian phase by 1.5 hours. Amber-tinted glasses blocked 65% of effect.
Key Findings
1. Blue light suppresses melatonin 55%
2. Circadian phase delayed 1.5 hours
3. Amber glasses block 65% of effect
4. Dim light (<10 lux) minimally disruptive