Sleep Debt: Brain Score

How sharp is your brain today? Sleep Debt looks at your last 14 nights and tells you — as a single number. Most sleep apps show you last night. But one good night doesn't erase a week of short sleep. Sleep Debt adds up the hours you've missed over the last 14 nights against your own sleep goal, weighting recent nights more heavily, and turns that into a forecast of today's mental capacity. "Your brain is at 78% today. Do the hard task tomorrow morning." EXAM MODE Studying for the SAT, finals or another big exam? Add the date: we'll show a countdown and the bedtime that gets you to exam morning debt-free — and remind you why sleeping beats cramming in the last nights. FREE — NO ACCOUNT NEEDED • Sleep debt score: how many hours you're behind, from your last 14 nights • Today's performance forecast: your estimated mental capacity, in % • Tonight's bedtime: a personal suggestion based on your wake time and debt • Recovery estimate: how many nights it takes to pay the debt back • Exam mode: countdown and a plan to arrive debt-free • Home Screen and Lock Screen widgets: your capacity and bedtime at a glance • Apple Watch app and watch face complications • Siri: "Sleep Debt capacity" and "Sleep Debt bedtime" • Share your score as an image • Morning check-in and weekly sleep recap • Works with Apple Health and Apple Watch — or enter sleep manually • Evening and morning reminders PREMIUM • Your daily focus hours: when to schedule your hardest work • Personal AI analysis of every night: what happened and what to do tonight • 90-day trends for sleep duration, debt and sleep stages • AI trend report for any period BUILT ON SLEEP RESEARCH The model is based on sleep-restriction research (Belenky et al., 2003) and sleep homeostasis: missed sleep accumulates, and cognitive performance falls with it — even when you don't feel tired. PRIVATE BY DESIGN No account, no sign-up. Your sleep data is stored on your device. AI analysis is optional: only when you allow it, the sleep durations and stages of the analyzed nights are sent to Anthropic's Claude model, without your name or email. Sleep Debt is not a medical device and does not diagnose or treat any condition. SUBSCRIPTION Premium is available as an auto-renewing subscription. Payment is charged to your Apple ID account at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. You can manage or cancel it in your App Store account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://cooperative-parrotfish-b07.notion.site/Uyku-Borcu-Gizlilik-Politikas-Privacy-Policy-406e84385ddd80cfa69df02e9dadb26d