I know a lot of kids go through a phase where it seems like everything that comes out of their mouths starts with "Why?" Kate never really did this, but she has been asking some tough questions lately:
Where do boogers come from?
How is water made?
Can you sneeze while you're asleep?
I know sneezing while driving is always tricky, but I don't think I've ever had any trouble with sleep-sneezing, so I'm guessing the answer to that last question is no.