"Because I don't have the courage to do it when I'm awake," said Mr Green.

Mr Green says, "Because I have little chance to talk in the daytime."

Mr Green always talks in his sleep. One morning the Greens get up. Mr Green sits at the table, his wife, Mrs Green asks him, "Why did you always talk in your sleep?"

The next morning their children all go to school. Mrs Green asks her husband angrily, "Wait a moment! Why did you scold me in your sleep last night?"