Research
Hormonal
Blue light (short-wavelength) is the most effective at resetting the human circadian system and suppressing melatonin.
Prioritize blue light exposure during the day to boost alertness and set your circadian clock. Avoid blue light from screens and bright lights in the evening to protect melatonin production.
StrongSupportsVERY_HIGH confidence
circadian phase resetting and melatonin suppression in response to bright monochromatic light is most sensitive to short-wavelength (blue) light
Why this rating
Based on studies with monochromatic light and blind individuals.
Source
Sleep and Circadian Rhythms in Humans
Charles A. Czeisler et al. · Cold Spring Harbor Symposia on Quantitative Biology · 2007
DOI 10.1101/sqb.2007.72.064
narrative_reviewCited 403×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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