In March, Facebook Messenger provided you with a cradle, where if you were sending an emoji with the crescent to a friend then your screen would switch to night mode.
As of yesterday and for the whole world, the night button has been added to the Messenger settings operation, so you can darken your screen whenever you want.
Night mode, or “dark mode”, changes the screen in Messenger, removing the white and perhaps annoying background and making it black. In theory, it is easier on the eye and with less consumption energys.
To turn your Android screen to night mode, tap on your profile picture inside the app. You will enter your preferences and settings. Then, on top of it menu, you will see a switch labeled “Night mode”. Press it and the screen will go black.
The feature, announced yesterday, is in development deliverys, to users around the world. If you can't see it, you may need to update the app, as it has already arrived in Greece.
Facebook notes that you can still enable dark mode by simply sending a moon emoji to your friends. This option remains for the stuck friends of emojis. But for everyone else, better to follow the above steps.