Me: "So Lucy, what happens when the sun goes down?"
Lucy - aged 4 years "The moon comes up!"

I knew that !!!
Me: "Okay, so the sun comes up in the morning (she'd told me this 30 seconds earlier) - what part of the day is it now?"
The time was actually 5pm
Lucy: "Well, the sun's up so it must be morning".

Logic at work!!