Why my iPhone 15 Plus sleep tracking is not working?
it worked earlier but now it doesn’t
[Re-Titled by Moderator]
iPhone 15 Plus, iOS 18
After iOS 18 this needs an Apple Watch to track.
It appears that Apple made a change in iOS 18 that impacted the built-in sleep tracking feature, removing the ability to track sleep directly with just an iPhone. Previously, you could use the iPhone's sensors to track sleep patterns without needing an Apple Watch, but with iOS 18, this feature now requires pairing with an Apple Watch (or other compatible devices).
This change might have caught you off guard, especially if you've been using your iPhone to track sleep patterns up until now. If you want to continue tracking your sleep, you’ll need an Apple Watch, as the sleep tracking functionality has shifted to rely on the Watch's more advanced sensors (such as heart rate and movement tracking).