​​Twitter released a "Lights Out" mode (dark black) on Android to the alpha version and here is how to get it
https://www.testingcatalog.com/report/amp/twitter-released-a-lights-out-mode-dark-black-on-android-to-the-alpha-version-and-here-is-how-to-get-it

"Lights Out" mode has been tested with a limited amount of users for a while now but today it has been released with the alpha version of Twitter for Android. And it means that you can easily try it out!

First of all, you need to get Twitter alpha APK.
As soon as you have an APK with the latest version 8.19.0-alpha.03 (or higher) you can find a new setting in the menu.

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