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The spectral composition of evening light and individual differences in the suppression of melatonin and delay of sleep in humans
How the color of evening light and personal differences affect melatonin levels and sleep timing in people
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Abstract
Light exposure at home in the evening significantly affects circadian physiology.
- The evening rise of melatonin, sleepiness, and sleep onset varied significantly across different light conditions.
- Effects on melatonin and sleepiness were largely mediated by the melanopsin photoreceptive system.
- Individual sensitivity to light's disruptive effects on melatonin showed robustness against experimental changes.
- The spectral composition of artificial light may be modified to reduce its negative impact on sleep and circadian rhythms.
- Findings suggest a connection between artificial light exposure and sleep disorders, such as delayed sleep phase disorder.
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