1) click generial
2) click Setting you will Brightness & Wallpaper click on B - W,you will have control the brightness the way you like, so it does not hurt your eye at night.
3) you can switch your screen when you read at night, so it does not bother your eye.
4) click on generial icon there you will see icon call Accessibility click on that icon then you will see version ( black or white) only when you preferre to switch during your reading time. So the brightness does not bother your partner or your eye.