You're logging eight hours, your wearable says your sleep score is 82, and yet you wake up feeling like you lost a fight with your own mattress. This episode dismantles the biggest misconception in sleep science — that duration is the metric that matters — and digs into what the research actually says about sleep architecture, why timing and cycle completion may matter far more than your total hours logged, and the surprisingly mundane habits that are quietly wrecking your restorative sleep without showing up in any app. No blackout curtains required.