Apple’s upcoming iOS 26.4 update expands sleep tracking inside the Health app with a new Average Bedtime metric that helps you understand whether consistent sleep timing affects your rest quality over time, and it now sits inside a fresh Sleep Highlight card that compares the time you actually went to bed with the time you usually go to bed.
The system calculates this pattern using a two week average, which makes the trend easier to understand than a single day reading, and it now complements the existing seven day average sleep duration metric introduced earlier in iOS 26.3 so you can compare both total sleep and schedule consistency in one place without opening multiple charts.
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Apple also updated the Health app’s Vitals overview in the United States, bringing blood oxygen data back into the daily line graph so the overview finally reflects all tracked health signals together instead of separating oxygen into its own isolated section.
Previously, the graph skipped oxygen readings even though the metric existed, but the limitation came from the patent dispute with Masimo, which led to an import ban and forced Apple to remove on watch blood oxygen measurements in early 2024 while still allowing phone side reporting later in August 2025.
Because of that restriction, you still cannot measure blood oxygen directly on the Apple Watch in the U.S., and the readings appear only on the iPhone inside the Health app after syncing supported data.
iOS 26.4 is currently available for developers and public beta testers, and Apple plans a wider public release in spring.
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