Sleep Debt Calculator

Sleep debt builds when you repeatedly get less sleep than your selected target. Over several nights, even relatively small shortfalls can add up.

The number above is best treated as a planning estimate, not a medical measurement. Your individual sleep need may differ from the target you selected, and sleep quality and timing also affect how rested you feel. If you're noticing daytime effects, our guide to common sleep debt symptoms covers the signs to look for.

If you want to understand the difference between a short-term sleep deficit and ongoing sleep restriction, read our guide to Sleep Debt vs Sleep Deprivation.

Rather than trying to erase a large sleep deficit in a single night, focus on returning to a consistent sleep schedule and giving yourself enough opportunity to sleep over the following nights.

A modestly earlier bedtime may be easier to maintain than a dramatic one-time change. Keeping a reasonably consistent wake time can also help maintain a stable sleep schedule.

For a more detailed overview, read our guide to How to Recover From Sleep Debt.

If you regularly give yourself enough time to sleep but continue to feel unusually tired, or you have persistent difficulty sleeping, consider discussing it with a qualified healthcare professional.