I took me months to work this out, so I thought I would share. So say you get involved in any sort of "sitting in the nursery in the dark keeping the baby company while it falls asleep" type of activities. You can't read a book, it's too dark. But you can play on your PSP! Or DS or phone, but I'm playing Lumines, it's the right difficulty for the middle of the night. And a stylus might get lost in the dark.