Everyone knows you're supposed to get eight hours — but where did that number come from, and does it actually apply to you? This episode digs into the real science of sleep architecture, why your fitness tracker's 'sleep score' might be doing more harm than good, and what decades of polysomnography research says about individual sleep needs versus the one-size-fits-all advice we've all internalized. We'll also look at the emerging research on sleep chronotypes and why fighting your natural rhythm might be costing you more than just energy.