Robert Sapolsky has spent decades mapping how chronic stress silently damages our bodies and brains. On Chris Williamson’s podcast, he zeroed in on ten everyday behaviors that junk your sleep, sour your mood and hijack your nervous system. These aren’t extreme habits—Sapolsky calls them “normal”—but they quietly throttle your resilience and drive up your allostatic load (the wear-and-tear your body experiences under stress). The very first habit he called out is replaying conversations in your head. When you obsess over past interactions—whether it’s a harsh comment, an awkward goodbye or something someone did “wrong”—you re-trigger the same fight-or-flight pathways as if it’s happening for the first time. Cortisol and adrenaline spike over and over, hours or even days after the event. That constant hormonal churn undermines deep sleep, ramps up irritability and primes your system for headaches, gut problems or even immune knockdowns. Breaking free means catching yourself mid-rumination and switching gears: label the loop (“Okay, I’m ruminating”), then refocus on something concrete—like reciting a poem, sketching, or doing a quick physical task—to shut down the stress circuit.