A major UK study tracking 90,000+ adults over 14 years found that people who slept in 1–2 extra hours on weekends had ~20% lower risk of heart disease, stroke, or heart failure — especially if they slept less than 7 hours on weekdays. But don’t get too comfortable: other studies show you can’t fully "undo" chronic sleep loss with weekend catch-up. Irregular sleep patterns still raise your risk of heart problems — even with enough total hours. ✅ Best approach? Aim for 7–9 hours of sleep every night with consistent bed & wake times. Weekend catch-up helps — but it’s not a long-term fix.