Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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Apple Acquires 'Beddit' iPhone-Connected Sleep Monitoring System
All of the data collected by the Beddit Sleep Monitor is then made available to iPhone users through an accompanying Beddit iPhone app, which provides "personalized insights" and "customizable sleep coaching" to help users improve their sleep habits.
According to the Beddit website, the device uses ballistocardiography (BCG) to measure the mechanical activity of the heart, lungs, and other body functions. When the heart beats, for example, the Beddit sensor can measure the mechanical impulse generated by the acceleration of the blood through the circulatory system.