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Every morning when you wake up, your Apple Watch gives you a number from 0 to 100. That's your sleep score. Higher means you slept better.
Here's how it breaks down:
- 50 points for how long you slept
- 30 points for going to bed at consistent times (looks at the last 13 nights)
- 20 points for how often you woke up during the night
So if you slept a full 8 hours but your bedtime is all over the place, you might score lower than expected. The watch rewards routine.
What the numbers mean in practice:
- 90+: You crushed it. Great sleep.
- 70-89: Solid night. You're doing fine.
- 50-69: Okay sleep, but something's off. Maybe went to bed too late or woke up a lot.
- Under 50: Rough night. You probably feel it.
The interesting thing is how it reveals patterns. Users have noticed that scrolling on their phone past 11 PM consistently drops their score by 8-12 points. The watch shows you the correlation between your habits and your sleep quality.
A few things to keep in mind: The watch tracks sleep stages (deep, REM, light), but it's only about 62% accurate compared to medical sleep studies. It tends to underestimate deep sleep specifically. So take those detailed breakdowns as rough guides, not gospel.
Also, you don't need a Series 11 for this feature. It's part of watchOS 26 and works on Series 6 and newer. Apple added it across the board.
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