Add up accumulated sleep debt from a series of nights against a target amount of sleep.
How It Works
How Sleep Debt Calculator Works
For each night you enter, the calculator compares your actual hours slept against your target and adds up the shortfall — a night where you slept more than the target simply contributes zero rather than offsetting other nights' deficits, since sleep debt is understood to accumulate rather than average out.
FAQ
Frequently Asked Questions
Can you fully "pay back" sleep debt with one long night?
Research suggests it's harder than it sounds — while extra sleep does help with recovery, chronic accumulated sleep debt doesn't fully reverse with a single long night the way this simple running total might imply; it's a useful tracking tool more than a precise physiological model.
What target should I use?
Most adults are recommended 7–9 hours per night, so 8 hours is a reasonable default target, though individual needs vary somewhat from person to person.
