Two of the features Android Pie brings are Adaptive Brightness and Adaptive Battery. Android Q brings another one called Adaptive Sleep.
Some of those who have installed Android Q Beta 3 have discovered the new feature under the settings menu. If you are running Android Q Beta 3, search for Adaptive under the settings menu. If it is available for you, it should be among the search results.
The description for Adaptive Sleep says “Your screen would not dim and go to sleep if the device detects your present attention.”. From the description, it appears the phone will be able to detect if you are looking at it even if you are not touching it and prevent the screen from going to sleep.
This is similar to Samsung‘s Smart Stay which launched with the Galaxy S3. The feature made use of the phone’s front-facing camera to know if the user is looking at the screen.
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There is no toggle for the feature and because this is still in beta, it means it is unfinished. We don’t know if Google will also use the front camera for this feature. If it uses the camera, that doesn’t make any sense regarding privacy concerns.
(Source)
