In this cozy (and slightly giggly) deep dive, Roxie unpacks one of biology’s strangest mysteries — sleep. Why do we spend a third of our lives basically unconscious, vulnerable, and drooling on our pillows — and yet, somehow, it’s the key to survival? Following last week’s episode on Why We Dream, Roxie takes us behind the eyelids to explore what’s really happening when we drift off. From the body’s late-night repair crew and the brain’s glymphatic “janitors,” to the memory-sorting chaos of REM cycles, this episode explores how sleep acts as our built-in reset system — for our cells, our minds, and even our emotions. She also tackles what happens when we don’t sleep (spoiler: it’s not pretty), why blue light ruins our bedtime, and how our circadian rhythm keeps us synced with the sun — unless, of course, we’ve been doomscrolling at 1 a.m. Between relatable stories, easy-to-grasp science, and Roxie’s signature warmth, “Why Do We Sleep?” reminds listeners that rest isn’t wasted time — it’s the most productive “doing nothing” you’ll ever do. So, grab your blanket, silence your phone, and get ready to appreciate the one thing your body’s been begging you for since… forever.