Sleep Debt Calculator

last 7 nights against your own target — arithmetic, not diagnosis

My targethours/night (set it to your real need, not a headline number)

Sat

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Sun

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Mon

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Tue

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Wed

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Thu

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Fri

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7-night debt

56.0h

Surplus

0.0h

Average

–h

No Fibs — Honest Limitations

This computes simple subtraction over 7 nights; the metaphor of "sleep debt" is partially supported at best — weekend catch-up sleep restores some alertness but does not fully reverse the metabolic and attention effects of chronic short sleep, and there is no evidence long sleep "banks" future credit. Individual sleep need varies (6–10 hours); if you routinely sleep far from your target and feel impaired, that's a health-professional conversation. Entries save only in your browser.