Sleep debt calculator
Compare what you usually need with what you actually got — then see the gap for one night or a short stretch.
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How to use it
“Debt” here is simply need − got (per night × nights). You cannot bank sleep perfectly, but a clear gap helps you prioritize an earlier night instead of another late caffeine hit.
Related: screen cutoff · 3am wake-ups
Educational tool only — not a clinical sleep study.