What is sleep debt, and can you pay it back?
Sleep debt is the running gap between the sleep your body needs and the sleep you actually get. If you need 8 hours but average 6.5, you accumulate roughly 1.5 hours of debt per night. Short-term debt can be partly repaid with extra sleep, but chronic debt hurts recovery, mood, focus and metabolic health — and can't be fully "caught up" on a single weekend.
How sleep debt adds up
Debt accumulates night over night against your personal need. A few short nights create a deficit you'll feel; consistently short sleep builds chronic debt that a lie-in only partially offsets. Consistency — similar sleep and wake times — matters as much as total hours.
How Vita tracks sleep debt
Vita reads your sleep from Apple Watch or WHOOP and shows your accumulated sleep debt alongside efficiency, deep/REM structure and consistency, so you can see how much you need to recover — and how sleep is affecting your Recovery score.
FAQ
Can you catch up on sleep debt?
Partly. Short-term debt responds to a few nights of extra sleep, but you can't fully repay chronic debt in one weekend — steady, adequate sleep is what clears it.
How much sleep debt is too much?
There's no exact threshold, but a persistent multi-hour deficit that leaves you tired, unfocused or under-recovered is a sign to prioritise sleep.
How does Vita know my sleep debt?
It compares your actual sleep (from Apple Watch or WHOOP) against your need and tracks the running gap over time.