How Light at Night Can Trick Your Brain
Home lighting, blue-light filtering, and their effects on melatonin suppression
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Brown-tinted glasses reduced melatonin suppression to below 0.3%, while most other 'blue-blocking' lenses did little.
Consumers assume all blue-light glasses help sleep, but this study shows only specific amber-to-brown tints are effective — most marketed products fail.
Practical Takeaways
Switch to warm white (2700K or lower) or tunable LED bulbs in evening-use areas like bedrooms and living rooms.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Brown-tinted glasses reduced melatonin suppression to below 0.3%, while most other 'blue-blocking' lenses did little.
Consumers assume all blue-light glasses help sleep, but this study shows only specific amber-to-brown tints are effective — most marketed products fail.
Practical Takeaways
Switch to warm white (2700K or lower) or tunable LED bulbs in evening-use areas like bedrooms and living rooms.
Publication
Journal
Scientific Reports
Year
2026
Authors
Emiliano Terán, C. Yee-Rendon, Hugo J Sosa-Arámbula, A. K. De la Herrán-Arita, R. L. Woods
Related Content
Claims (6)
Cool white LED lights might mess with your sleep more than old-style light bulbs because they affect your body's internal clock more, even if they look just as bright. Old incandescent bulbs are gentler on your circadian rhythm at night.
Being around blue light at night, like from phones or screens, might keep your body from making the sleep hormone melatonin because it keeps stress hormone levels high, making it harder to fall and stay asleep.
Cool white light bulbs, like some LEDs and CFLs, might mess with your sleep more than warm yellowish ones because they can reduce a sleep hormone called melatonin more strongly.
Changing your LED light from cool white to warm white in the evening can cut down how much it messes with your sleep hormones by over 99%.
Wearing brown-tinted blue-light-blocking glasses like Swanwick or THL Sleep at night might help protect your sleep hormone way better than other blue-light glasses by blocking more of the light that messes with your body clock.