Sleep Mode
It looks like Apple will be expanding its Bedtime feature from iOS 10 throughout the entire system, with a new “system-wide Sleep Mode” that can be enabled from Control Center, automatically setting Do Not Disturb, darkening the Lock Screen, and more. We’re also hoping this will include some much-needed improvements to the Bedtime feature itself, such as setting different schedules.
This is likely a first step to the sleep tracking features that could be coming to the Apple Watch next year, but also will hopefully include APIs to allow third-party apps to more effectively plug into it as well.