How Much Sleep Do Adults Need?
Seven to nine hours for most adults, and the cost of shortchanging it.
Recommended hours
Adults need seven to nine hours, with older adults needing seven to eight. A few people function well on slightly less or more.
Sleep debt
Regular short sleep builds up debt that affects mood, attention, appetite and immunity. Weekend catch-up helps partly but does not fully reverse it.
Paying it back
Add 30 to 60 minutes of sleep nightly until you wake without an alarm feeling refreshed.
Try it: Sleep Debt Calculator
Example with sample values. Open the full calculator →
Slept this week48.5 h
Sleep debt7.5 h
Average6.9 h
A debt of 7+ hours affects mood, focus and health. Add 30–60 minutes of sleep nightly rather than one long lie-in.
Educational content only. This article does not replace advice from a qualified health professional. Medical disclaimer.