Samsung One UI has a system-wide Night mode, here's how to enable it
However, this is going to change in Samsung's new One UI, which is based on Android Pie, and has a dedicated Night Mode that's easy on the eyes. Samsung users have been able to apply dark themes in the past, which do alleviate some of the annoyance linked to staring at a white light while in bed late at night, but some parts of the interface are locked to theme makers. With the new Night mode in Samsung One UI, users can finally rest their eyes and enjoy one of the best features of AMOLED displays – the ability to switch black pixels completely off.
Best of all, if you want to reduce eye strain when reading late at night, but otherwise dig the lighter appearance of the UI, you can schedule Night mode to turn on only at a specific time. To enable the new mode, go to Settings > Display, and select Night mode. Alternatively, you can do it from the quick toggles menu by swiping down on the notification bar or ask Bixby to enable Night mode.
And there you have it, you can now use your phone in the dark without wanting to gouge your eyes out! Only if more apps would allow for the same...