f.lux fixes this: it makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day.It's even possible that you're staying up too late because of your computer. You could use f.lux because it makes you sleep better, or you could just use it just because it makes your computer look better.

Great dark minimal theme for phpmyadmin

It is a tool for checking foreground and background color combinations of all DOM elements and determining if they provide sufficient contrast when viewed by someone having color deficits.