Sleep Debt Calculator
Track your sleep deficit over the last 7 nights. Customize extends to 14 days, adjusts for naps, and picks recovery rate.
Last 7 nights actual sleep
Hours you actually slept each night
Recovery plan
At standard rate (+60 min/night), sleep extra for 11 nights to clear the deficit.
Research caveat: a single 12-hour weekend sleep doesn't fully fix chronic weeknight debt — the cognitive recovery is gradual.
By night
- 7 nights ago7h−1h
- 6 nights ago6.5h−1.5h
- 5 nights ago7h−1h
- 4 nights ago6h−2h
- 3 nights ago7.5h−0.5h
- 2 nights ago6h−2h
- Last night5.5h−2.5h
Related tools
How to use
- 1
Enter your target sleep (hours per night). Adults: 7-9 is standard.
- 2
Enter how many hours you actually slept each of the last 7 nights.
- 3
Customize lets you extend to 14 days, add average nap minutes (counted at 50% toward debt), and pick the recovery rate (gentle +30 min/night, standard +60, aggressive +90).
- 4
The calculator shows your total deficit, average actual, health zone, and how many nights of extended sleep would clear the debt at your chosen recovery rate.
Frequently asked questions
Partially. A 2016 University of Chicago study found that 3 nights of recovery sleep restored most cognitive markers, but not all — chronic deficit causes inflammation and metabolic changes that take weeks to undo. The lesson: small daily deficits compound. Catching up on weekends doesn't fully fix five weeknights of 5-hour sleep.
The American Academy of Sleep Medicine and the National Sleep Foundation both recommend 7-9 hours for adults 18-64. Some genetic outliers thrive on 6 — they're rare (~1% of the population). For everyone else, claiming to function on 5-6 hours usually means functioning while sleep-deprived, not adapting to less sleep.
Partial. A 20-30 minute nap restores alertness for several hours and contributes about half of equivalent night sleep toward debt repayment (Customize mode counts it at 50%). It does NOT replace night sleep for memory consolidation, hormone regulation, or long-term cognitive recovery. Treat naps as a top-up.
Gentle (+30 min/night) is the most sustainable — easiest to integrate into a normal schedule. Standard (+60 min/night) is the research baseline. Aggressive (+90 min/night) is only viable for 3-5 days max before the schedule itself causes disruption. The bigger your debt, the longer recovery should be — and that means slower nightly bonus, not bigger.
The calculator measures deficit, not blame. If your situation forces a deficit, you can use this to (a) see how big the deficit really is, (b) plan recovery on off-days, and (c) discuss with your doctor if you're consistently >2 hours below target. Shift workers carry a chronic deficit measurable in this tool.
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Source: American Academy of Sleep Medicine; University of Chicago recovery sleep research (2016) · Last verified 2026-06. This tool provides estimates only and is not legal, tax or financial advice. Always verify your specific situation with the relevant UAE authority or a licensed advisor before taking action.