Early morning sunlight provides different health benefits than evening sunlight
Early morning sunlight and evening sunlight have distinct physiological effects on humans, largely because light exposure at different times of day elicits divergent responses from the circadian system and melatonin regulation.
The retrieved literature consistently establishes that light exposure timing alters circadian phase responses, melatonin secretion, and biological rhythms differently depending on whether it occurs in the morning or evening/night. The claim is well supported by chronobiology studies.
Christine Blume, Corrado Garbazza, Manuel Spitschan. Effects of light on human circadian rhythms, sleep and mood. 2019. https://doi.org/10.1007/s11818-019-00215-x
Discusses how morning light and evening light exert different physiological and psychological effects on human circadian rhythms, sleep, and mood.
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Leena Tähkämö, Timo Partonen, Anu‐Katriina Pesonen. Systematic review of light exposure impact on human circadian rhythm. 2018. https://doi.org/10.1080/07420528.2018.1527773
Demonstrates that light exposure timing (morning vs. evening) differentially affects circadian phase positioning and melatonin regulation.
María‐Ángeles Bonmatí‐Carrión, Raquel Argüelles-Prieto, María José Martínez-Madrid, Rüssel J. Reiter, Rüdiger Hardeland, María Ángeles Rol, Juan Antonio Madrid. Protecting the Melatonin Rhythm through Circadian Healthy Light Exposure. 2014. https://doi.org/10.3390/ijms151223448
Points out that the biological impacts of light, such as blue light exposure, vary markedly depending on whether they occur during the day or at night.
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