Since Apple Watch was first released in 2015, Apple has been promoting it as a health and fitness tracker, but it has never used the built-in sleep tracking capabilities.
Looks like it's about to change.  On Monday, Jay Peters of The Verge reported that a listing on the App Store for the Apple Watch Alarms app seems to refer to an unknown Sleep app developed by Apple. A sample screenshot of the Alarms program shows an alarm for 7am and a text that reads "Set Sleep Time and Wake Up in the Sleep App."
This language seems to indicate that Apple will release the Sleep app, which allows you to set an awakening time similar to the iPhone Clock app. The Sleep app is likely to track sleep patterns and wake you up at the best time in your sleep cycle, as other programs do, reports The Verge.
Apple Watch Series 5 Introduced Other Features with advanced health tracking technology, including the ability to track your heart rate and alert you to irregularities, Series 5 also comes with a native cycle tracking app that follows your menstrual cycle.
a way to expand Apple's health offerings, and the company has previously indicated possible sleep plans. In 2017, Apple acquired Finnish hardware company Beddit. In February 2019, Bloomberg announced that Apple is testing sleep monitoring technology for future Apple watches, with plans to announce new capabilities by 2020.
Shortly after The Verge spotted a potential Sleep program, Apple removed any links to the app. He did not release any official announcement regarding the Dream program. An Apple representative was not immediately available for comment.