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Chronobiology πŸ‡ΊπŸ‡¦ UA

πŸŒ… Seasonal Rhythms

Day length changes with latitude and season via Earth's axial tilt. Shorter days trigger longer melatonin secretion windows; in susceptible individuals, light deprivation reduces serotonin and causes Seasonal Affective Disorder (SAD). Light therapy compensates by suppressing melatonin onset.

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Day length
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Melatonin h
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Mood index
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Sunrise
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