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Morning Light & Circadian Timing

早晨光照 · 昼夜节律

Place · Level 3

Nearby

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Eyes · Myopia · ScreenssynergyOne dose of outdoor light does two jobs: it slows axial elongation of the eye (time outdoors is the strongest-evidence myopia lever we have) and it resets the circadian clock through retinal ipRGCs. Sending a child outside buys both.

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Connected to · 1

synergy · 1

Eyes · Myopia · Screens
One dose of outdoor light does two jobs: it slows axial elongation of the eye (time outdoors is the strongest-evidence myopia lever we have) and it resets the circadian clock through retinal ipRGCs. Sending a child outside buys both.

光是校时信号

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Light is a clock signal

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Morning sunlight is less about 'energy' and more about clock-setting. Light-sensitive ipRGCs in the retina send a signal to the suprachiasmatic nucleus: The brain's master clock — set by light, it runs the body's day–night rhythm., 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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Educational content, not medical advice — consult a clinician.