Frequently asked questions

Sleep Stats is a personal sleep observatory for iPhone and Apple Watch. It reads the data your devices already record into Apple Health and turns it into a single, calm instrument panel — sleep score, sleep stages, recovery, strain, body battery, overnight vitals, and a smart bedtime suggestion.

An iPhone running iOS 18 or later, with Apple Health set up. For overnight sleep stages, heart rate, and HRV, you'll want an Apple Watch on watchOS 10 or later worn to bed. The app needs permission to read HealthKit data.

For the full picture — sleep stages, overnight heart rate, HRV, and respiratory rate — yes, an Apple Watch worn overnight provides the richest data. If you track sleep another way that writes to Apple Health, Sleep Stats will display whatever is available, but some metrics may be limited without a watch.

Not currently. Sleep Stats is built directly on Apple HealthKit and the Apple Watch, so it's iPhone‑ and Apple Watch‑only for now.

Yes. Sleep Stats reads from HealthKit and does its math on your device. There's no Sleep Stats account, no cloud database of your health data, and no third‑party advertising or analytics tracking. Read the details in our Privacy Policy.

No account is required, and the core experience works offline. A connection is only used for things like downloading the app and handling App Store purchases — never to upload your health data.

Yes — you can export your readings as plain CSV from within the app, so your numbers stay portable and yours.

Open Settings → Health → Data Access & Devices → Sleep Stats and toggle off any categories you'd like to revoke. The related metrics simply stop showing in the app.

The Sleep Score is a 0–100 rating weighted on sleep duration, depth (time in deep and REM), continuity (how few times you woke), and overnight breathing. It's designed to reflect whether the night actually restored you — not just how long you were in bed. It's an estimate, not a clinical measurement.

Recovery compares last night's HRV and resting heart rate to your own baseline. Strain estimates how hard your day was on your cardiovascular system, calibrated to your fitness. Body Battery charts how much capacity you have left through the day. Together they tell you whether to push, hold, or rest.

It folds together your recent sleep debt, your training load and energy burned, and your usual wake time into one recommended target sleep for tonight — so you get a concrete bedtime instead of a guess.

Every app uses its own model and weighting, and sleep staging from a wrist sensor is an estimate. Small differences between apps are normal. Use Sleep Stats to spot your trends over time rather than to compare a single night against another tool.

Sleep Stats is free to download and try. Premium unlocks the full observatory — deeper history, the complete metric set, and advanced views. You can see the current split right inside the app before you buy.

Go to Settings → your name → Subscriptions on your iPhone, select Sleep Stats, and cancel. You'll keep Premium until the end of the current billing period. See the subscription terms for details.

Use Restore Purchases in the app's settings to re‑sync Premium on a new device. Refunds are handled by Apple — request one at reportaproblem.apple.com.

Widgets refresh in the background and can lag behind by design. Open the app once to force a fresh read, confirm Sleep Stats still has HealthKit permission, and make sure Background App Refresh is enabled in iOS Settings. If it persists, let us know.

That usually means there's no sleep recorded yet for the period, or a HealthKit permission is off. Wear your Apple Watch to bed, then check Settings → Health → Data Access & Devices → Sleep Stats and enable the categories you want. New data appears after your next synced night.

Email contact@sleepstats.app or head to our contact page. We read every message.