In March, the Facebook Messenger provided you with a loophole where if you sent a crescent moon emoji to a friend then your screen would switch to night mode.
From yesterday and all over the world, night mode has been added to your Messenger settings so you can black-out your screen whenever you want.
Night mode, or "dark mode", changes the screen in Messenger, expelling the white and possibly annoying background and making it black. Theoretically it is more relaxing to the eye and with less energy consumption.
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 delivery, 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 n choice remains for the stuck-up friends of emojis. But for everyone else, better to follow the above steps.