🌙Sleepgoody

Sleep Debt Calculator

Sleep debt is the gap between the sleep you needed and the sleep you got. Enter your last 7 nights and see what you owe — and how long it takes to pay back.

How sleep debt is calculated

For each of the last 7 nights we take the hours you slept and subtract your nightly goal. Nights above goal offset nights below it. The total shortfall is your sleep debt.

This calculator uses a 7-night window because that is the span most closely tied to how you feel now. Debt older than about a week has partly been absorbed, and partly done damage you cannot undo by sleeping in.

How long does it take to pay back?

You cannot repay it in one night. Sleeping far beyond your normal need has diminishing returns, so the plan above spreads recovery over as many nights as it takes at a realistic maximum of 2 extra hours per night. A 9-hour debt is four or five nights of slightly longer sleep, not one enormous weekend lie-in.

See a night-by-night catch-up schedule for the number above, with the date you’re clear.

Curious how your number compares? We asked more than 20 night shift workers what they actually sleep — the average was 5.6 hours a night.

Is sleep debt real?

The shortfall accumulating is well established; the idea that you can clear a large balance in a single session is not. Consistency beats catching up. The practical use of the number is as a signal — if it keeps climbing week over week, something in your schedule needs to change rather than be compensated for.

Sleepgoody is a self-care tool, not a medical device. It does not diagnose or treat any condition. If you are persistently exhausted despite adequate sleep, talk to a doctor.