Forget the simplistic advice to just "go to sleep early" or the rigid obsession with hitting an exact eight-hour quota every night. Over-sleeping and weekend "sleep marathons" have quietly evolved into a common yet misunderstood phenomenon—leaving millions waking up with pounding headaches, stiff necks, and a profound sense of brain fog, while mistakenly believing they have recharged their batteries. In this episode, we unpack the counterintuitive science of oversleeping and examine how the popular "more sleep is always better" mindset fails to align with human biology. Drawing on groundbreaking research—including a Columbia University study of nearly 500,000 adults published in a Nature sub-journal—we reveal how sleep duration and biological aging form a distinct U-shaped curve, where sleeping regularly over eight hours can spike overall mortality risk by 40% and accelerate cellular aging just as severely as pulling an all-nighter. We explore the critical medical boundary betwee...