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Melanopic irradiance defines the impact of evening display light on sleep latency, melatonin and alertness.
Light that activates melanopsin affects how quickly people fall asleep, melatonin levels, and alertness in the evening
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Abstract
Melanopic irradiance is associated with significant changes in sleep and melatonin levels in 72 healthy males.
- Low melanopic light shortens the time to fall asleep compared to high melanopic light.
- Evening melatonin suppression is attenuated with low melanopic light exposure.
- Morning melatonin levels are reduced when exposed to low melanopic light.
- Evening melatonin onset occurs earlier with low melanopic light than with high melanopic light.
- Dose-dependent increases in sleep latency are observed with higher melanopic irradiance.
- Subjective alertness does not significantly change with varying melanopic irradiance.
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