You stayed up until 2 a.m. finishing that project. You set your alarm for 6 a.m. You told yourself you'd sleep in on the weekend to make up for it. Sound familiar? Millions of people run this experiment every week — but the real question is: does catching up on sleep actually work? Sleep debt is one of the most misunderstood concepts in health. The truth lies somewhere between ‘it’s a total myth’ and ‘the damage is permanent’ — and understanding it could genuinely change how you approach your nights. In this article, we break down what sleep debt really is, what science says about recovering from it, and how to reset your sleep without ruining your weekends. What Is Sleep Debt? (And Why It Matters) Sleep debt — also called a sleep deficit — is the cumulative difference between the amount of sleep your body needs and the amount you actually get. It’s not just a metaphor. Your brain keeps a running tally. Think of it like a financial account: every hour of missed sleep p...