Enable the Hidden 'Night Mode' Setting on Android 7.0 Nougat

Step 1

Enable System UI Tuner

First up, you'll need to enable the hidden System UI Tuner menu on your device. To do that, swipe down twice from the top of your screen to fully expand the Quick Settings menu. From here, press and hold the little gear icon in the top-right corner, then let go after about 10 seconds. You'll be taken directly to your Settings menu, where you'll see a toast message that says "Congrats! System UI Tuner has been added to Settings."

Step 2

Install Night Mode Enabler

The app that enables Night Mode on Nougat is fittingly called Night Mode Enabler, and now that you've enabled the System UI Tuner, you're ready to install it. Google Play Store

Step 3

Enable Night Mode

Next, just open Night Mode Enabler, then tap the lone button in the middle of the screen. From here, you'll be taken to the hidden Night Mode settings menu in Android's System UI Tuner. Make sure that you enable the "On" switch at the top of the screen here, and if you'd like, you can adjust other Night Mode settings while you're at it.

Step 4

Add the Night Mode Quick Settings Tile (Optional)

With its default settings, Night Mode will automatically kick in at sundown in your location, then the blue-cancelling effect will continue to get stronger as it gets darker outside. But if you'd like to have a manual override switch to enable or disable Night Mode whenever you want, you can add a Quick Settings tile for this.

To start, swipe down twice from the top of your screen to fully expand the Quick Settings menu. From here, tap the "Edit" button, then scroll down to the bottom of the list to find the Night Mode toggle. Next, just long-press the toggle, then drag it up to the dark gray area at the top of this menu and drop it into place. From now on, you'll be able to tap this toggle to turn Night Mode on or off, irrespective of the automatic settings.

 How Night Mode Looks

Whether you enable it manually, or allow the feature to kick in by itself, Night Mode will make your screen appear slightly orange when it's active. This is because it's cancelling any blue light being emitted from your phone's display, as studies have shown that light frequencies in this spectrum can interrupt your circadian rhythm if viewed after sundown.

Troubleshooting

Some users have reported that they can't seem to add the Quick Settings toggle for Night Mode. If this ends up happening, the best workaround is to reset your Quick Settings toggles, then add the Night Mode switch again. To do that, just head to the "Edit" menu in Quick Settings, then tap the three-dot menu button in the top-right corner and choose "Reset." It's a minor bug, and possibly why Google left the feature out to begin with.

Enjoy................