As part of Android’s Digital Wellbeing efforts, Google has included a bunch of features that are designed to make phones a little more friendly to use before bedtime. For example, with Bedtime Mode, users can set a schedule to make their phones appear in grayscale, disable the always-on display, and activate do not disturb mode.
Now according to an APK teardown by 9to5Google, it appears that Android 13 will include some updates to Bedtime Mode, such as the ability to dim the brightness of a wallpaper. Users will be able to choose how much they want their wallpapers to be dimmed, where it can even go all the way to 0% which effectively blacks it out completely (text and icons are still visible).
This means that for users who might be running a particularly bright or colorful wallpaper, this feature will let you dim it at night before bed where the lights are either low or turned off to make your phone less glaring.
Android already has a dark mode that turns brighter UIs into darker colors to make phones less glaring, so essentially this update will be an extension of that. Keep in mind that this is still part of the Developer Preview/Beta, which means that there is a chance Google might not launch it when Android 13 hits its stable release, but it might be worth keeping an eye on anyway.