I have a little, mini internet tablet device that I keep on my night table to check email, and sometimes pop on to a website while in bed. So, when I do this, the room is typically, completely dark, the white would literally feel llike it was searing my eyes.
It only has a 4" screen, and part of that becomes a little touch screen keyboard when entering text, so when late at night I login as Tned-Mobile, you will understand why I make even more typos than normal.
I also use the tned-mobile account (which also has images turned off, etc. in the user options) when I login during the day on my Samsung Blackjack mobile phone, which also sometimes is done in a dark room, or say a car at night. This last month I have been in the car several times at night and logged into BM, and the white is just blinding when your eyes were used to the dark and 'normal' webpages.