Apple could be planning a major new feature for the Apple Watch. The company is reportedly working on adding sleep tracking to its smartwatch, something which has been requested by customers for years now.

With the Apple Watch Series 4, Apple introduced an ECG functionality. And the company is planning to add sleep tracking to the Watch by 2020, according to a new report from Bloomberg.

Details about the new sleep tracking feature is pretty much a mystery for now, though Bloomberg says Apple has already started testing the sleep tracking feature with actual users. The company is apparently testing the sleep tracking functionality with testers at secret sites around its Cupertino headquarters.

Apple Watch already offers sleep tracking through third-party apps, though those are pretty limited because of problems with battery life. If Apple does bring sleep tracking to the Watch, the company would have to extend the battery life on the Apple Watch or offer sleep tracking through a low-power mode that is capable of tracking your sleep without hurting the device’s battery. The feature will likely integrate with iOS’ existing Bedtime feature through the Clock app.

It will be interesting to see exactly how advanced Apple’s sleep tracking feature is going to be on the Apple Watch. The company is likely going to introduce the Series 5 Apple Watch later this year, though whether the sleep tracking feature will be available on the new version is unknown for the time being.

Tagged with Apple Watch