Rumor: Apple is testing a sleep tracking app for the Apple Watch

Apple is testing a sleep tracking app for the Apple Watch, according to report by Bloomberg's Mark Gurman, who has a good track record regarding Apple rumors.

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He says the tech giant has been using the sleep-tracking feature for several months with testers at secret sites around its Cupertino, California, headquarters. Gurman says that if the functionality is successful in the testing stages, the company plans to add it to the Apple Watch by 2020.