Morning Light & Circadian Timing早晨光照 · 昼夜节律

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晨光不是玄学能量, 而是 retina → SCN 的校时信号 · 早光推前, 晚光推后 · 连接 sleep / shift work / melatonin / all-nighter

Light is a clock signal

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光是校时信号

Morning sunlight is less about 'energy' and more about clock-setting. Light-sensitive ipRGCs in the retina send a signal to the , the brain's central clock; the SCN then broadcasts 'it is daytime' to body temperature, cortisol, melatonin, appetite, and attention systems.

That explains why someone can sleep 7 hours and still feel jet-lagged: the issue is not only duration, but whether sleep lands in the phase the body accepts.

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