There's probably some hidden meaning here. If only I could figure out what it was.
Actually there was a less obvious meaning. When I dreamed I was trying to stay awake driving into the sunrise, I woke to find that there were trucks carrying live trees all around me, in full spring color. The trucks were herding my car while I slept, keeping me on the road. I tried to keep my eyes open to see what the trees were, but the sunlight was too bright. But I know what they were now that I'm awake and can remember them and make sure. They were ash before me and elm beside me and fir behind me.
This is what happens when you let kids cut their teeth on D'Aulaire's Norse Gods and Giants (now D'Aulaire's Book of Norse Myths). Even when they're asleep you can't stop their brains from doing this sort of thing. It just sort of goes on and on.