You can try installing google play books. Then enable/disable night light feature inside it.
This night light is a feature present in the system, not in the app. Sometimes it enables itself and glitch. The only way to try that is by downloading this app.
We apologize for your inconvenience. We would request you to register your concern in Samsung Members Application. So, that our concern team gets back to you as soon as possible.
Please follow this path to register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Note. please attach the error log file within 15 minutes of the error occurred.
