Sleep Debt Calculator: How Much Sleep Do You Owe Your Body?
Sleep Debt Is Real — And It Compounds
If you need 8 hours of sleep but only get 6, you accumulate 2 hours of sleep debt per night. Over a typical work week, that’s 10 hours. Research shows this debt significantly impairs cognitive function, decision-making, immune response, and metabolic health — equivalent to being legally intoxicated after several days.
How Much Sleep Do You Need?
| Age Group | Recommended Hours |
|---|---|
| Teens (14–17) | 8–10 hours |
| Adults (18–64) | 7–9 hours |
| Older adults (65+) | 7–8 hours |
Can You Repay Sleep Debt?
Short-term debt (a few days) can be recovered with 1–2 extra hours per night over a few days. Chronic debt (months/years) cannot be "repaid" in a weekend — it requires consistent schedule improvement over weeks. Weekend binge-sleeping disrupts your circadian rhythm and makes things worse.
Recovery Strategy
- Set a consistent wake time (even weekends) to anchor your circadian rhythm
- Add 15–30 minutes of sleep per night (not hours) until you reach your target
- Avoid screens 1 hour before bed (blue light suppresses melatonin)
- Keep your bedroom cool (18–20°C), dark, and quiet
- Avoid caffeine after 2 PM (half-life is 5–6 hours)
Use the sleep calculator to find optimal bedtimes based on 90-minute sleep cycles and your wake-up time.