[orky56]

Majority of reading is done in a brighter setting so many factors contribute to using dark text in white background. In the case of reading in the dark or low light settings, using a Kindle Paperwhite gets complicated since you want to make the background darker while still maintaining sufficient contrast to read the text which is always in a dark font color.

In the UX StackExchange post, it's stated that astigmatism is also a contributing factor to favor dark text on white background. I do believe that these night time settings should be toggled automatically for white text with dark background as well as accounting for blue wavelength reduction for screens with full colors.

[Zak]

I would like operating systems, browsers and websites to globally support a "night mode" where a dark background is used. Especially with the proliferation of mobile devices, people increasingly use technology in low-light environments. As it stands today, I have to add external stylesheets to websites to get this effect, and if I want to toggle them, I have to toggle each one manually. It's similar, but worse for Android apps because the app itself has to support themes.

I find having a significant portion of the screen white when my eyes are relatively dark-adapted uncomfortable, even when the brightness is set fairly low. I find a dark background with light text very preferable under those conditions. I do not care if there is research suggesting I should not have this preference.

From talking to others in person and online, I get the impression that my preference is very common. Android was supposed to get something resembling this, but the feature has been dropped or delayed.