Apple Watch Sleep Tracking in watchOS 27: Every Confirmed Change for Series 12 and Ultra 4

Apple Watch Series 12 and Apple Watch Ultra 4 both list a sleep score and sleep apnea notifications, and both add an overnight vitals view that compares Recovery HRV with your personal baseline. What is easy to miss is where those changes live: Apple’s own watchOS 27 feature list does not name a single sleep feature. Apple Watch Series 12 lists a...