Research
Hormonal
Daytime exposure to bright light, particularly blue wavelengths, is beneficial for circadian entrainment and health, whereas nighttime exposure is disruptive.
Seek bright, blue-rich light during the day to strengthen your circadian rhythm. Avoid bright, blue-rich light at night to protect your sleep and hormonal balance.
GoodQualifiesHIGH confidence
Blue light, which is particularly beneficial during the daytime, seems to be more disruptive at night, and induces the strongest melatonin inhibition.
Why this rating
Supported by mechanistic studies on ipRGCs and epidemiological data on chronodisruption.
Source
Protecting the Melatonin Rhythm through Circadian Healthy Light Exposure
María‐Ángeles Bonmatí‐Carrión et al. · International Journal of Molecular Sciences · 2014
DOI 10.3390/ijms151223448
narrative_reviewCited 219×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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