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Sleep Debt Calculator

Enter how many hours you slept each night this week. See your total deficit, daily breakdown, and recovery timeline.

Hours slept each night (drag the sliders)

Personal sleep need hours/night

Sleep debt is calculated as the gap between your personal sleep need and actual sleep. Recommended adult range: 7–9 hours.

Total weekly sleep debt

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Night-by-night breakdown

Recovery timeline

The cost of sleep debt

Sleep debt accumulates like financial debt — and like financial debt, the interest compounds.

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Cognitive cost

After 17 hours without sleep, performance matches a 0.05% BAC. After 24 hours: 0.10%. Sleep debt causes the same impairment more subtly.

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Recovery takes time

You can't fully recover a week of debt in one weekend. Research shows it takes about 3 days of full sleep to recover 1 week of mild deprivation.

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You don't feel it

The more sleep-deprived you are, the less you perceive your own impairment. Chronically sleep-deprived people rate themselves as functioning normally.

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Long-term risks

Chronic sleep debt is linked to increased risks of obesity, type 2 diabetes, cardiovascular disease, and impaired immune function.

Common questions

Can you catch up on sleep debt?

Partially. You can recover acute sleep debt (1–2 weeks of mild deprivation) with a few nights of full sleep. But some research suggests that chronic long-term sleep deprivation may have lasting effects on the brain that can't be fully reversed by catch-up sleep. Prevention is better than recovery.

How do I know if I have sleep debt?

Signs include: feeling tired despite sleeping, falling asleep within minutes of lying down, needing an alarm to wake up (a well-rested person wakes naturally), difficulty concentrating, and irritability. If you sleep significantly more on weekends than weekdays, that gap is your weekly debt.

Is sleeping more on weekends bad?

Some recovery is beneficial, but large swings (2+ hours difference between weekdays and weekends) cause "social jet lag" — disrupting your circadian rhythm and making Monday mornings harder. Aim for a consistent schedule with no more than 1 hour variance between days.

How to calculate sleep debt accurately

Sleep debt is not just “less than 8 hours.” It is the gap between your personal sleep need and what you actually slept. This calculator lets you set that target, then totals the shortfall across the week.

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Personal sleep need

Most adults need 7-9 hours, but your own target may be 7.5, 8, or 9 hours. Use the target field to avoid overcounting or undercounting debt.

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Weekly sleep deficit

One short night is usually manageable. Repeated short nights compound into slower reaction time, worse focus, and stronger caffeine dependence.

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Recovery plan

Recover sleep debt gradually by adding 30-120 minutes over several nights. A single weekend lie-in rarely fixes a full week of restriction.

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Keep wake time stable

Large weekend swings can create social jet lag. Add sleep mostly by moving bedtime earlier and keeping morning light consistent.

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