Staying up late feels good for a while, but making up for it is a nightmare? 🔥 Science tells you: it takes 4 days to make up for every hour of sleep you stay up late! This "Sleep Debt Repayment Guide" reveals NASA-certified nap secrets, the 90-minute cycle method, and emergency solutions for staying up late. It turns out that sleeping until noon on the weekend makes you more tired? Save this scientific recovery strategy now!