What is the Sleep Score feature on Apple Watch Series 11?

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Sleep Score is a watchOS 26 feature that provides a simple daily rating of sleep quality, available on Apple Watch Series 11 and compatible older models.

How Sleep Score Works

Each morning displays a numerical score reflecting overall sleep quality, calculated from four factors:

Sleep Duration Verified sleep time based on movement, heart rate, and other indicators—not just time in bed.

Sleep Consistency How closely your bedtime and wake time matched your regular schedule.

Time Awake Frequency and total duration of nighttime wakings.

Sleep Stages Distribution of time in REM, Core (light), and Deep (restorative) sleep phases.

The Apple Approach

Sleep Score prioritizes simplicity over complexity. Rather than detailed charts and metrics, it provides a single number capturing overall sleep quality.

For deeper analysis, the Sleep app and Health app offer stage-by-stage breakdowns and trend analysis over time.

The Vitals App

Complementing Sleep Score, the Vitals app displays overnight heart rate, respiratory rate, wrist temperature, and blood oxygen levels. Significant deviations from your baseline trigger alerts.

Maximizing Accuracy

Sleep Score becomes more meaningful with consistent use. After several weeks of nightly wear and regular sleep patterns, the watch develops accurate understanding of your normal patterns, making scores more reliable and actionable.

Compatibility

Sleep Score requires watchOS 26 and works with Apple Watch Series 6 and newer—not exclusive to Series 11. However, the Series 11's improved battery life makes overnight wearing more practical, ensuring sufficient charge for the following day.