I've read a paper (and I can confirm that) that reading black on white is worse for the eyes, after a full working day on PC i wish I could read "dark" pages. In Samsung and Firefox browser one can use "inverted color" mode, where the background of the pages is automatically switched to a black color and other colors are updated accordingly.
So my request is: add an option to the night mode (or to the general options) to show page colors inverted, or in a "white text on dark background" mode. This would be really great.