In this episode, Emma Sullivan and David Park break down how artificial light at night disrupts your circadian rhythm and triggers measurable harm to your metabolism, immunity, and sleep quality—sometimes within just a single night of exposure. They trace the science from your brain's master clock to melatonin suppression, then translate research from institutions like Northwestern and the Salk Institute into realistic, accessible changes you can make, from morning sunlight exposure to dimming lights two hours before bed. You'll leave understanding why sleep quality matters more than you thought, and how to actually protect it without overhauling your entire life.
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