I have to say that when you tour the world obviously the jetlags and different hours and ways of living and traveling a lot of hours in the plane and you wake up in the morning and you're not quite sure where you are and it is very tiring.
I don't dream songs. I'm more apt to write dreams down and then to be able to interpret them into a song. I also tend to get up and write prose in the morning from which will come songs.