Read "When Owen's Mom Breathed Fire" by Pija Lindenbaum
In this funny tale, which never reveals Owen is dreaming, but is about his dream, one morning he wakes to find his mother has become a dragon. She has forgotten how to make breakfast, so they eat junk food. They visit the zoo, where his mom gets in for free as an animal; and the doctor, who has no anti-dragon shot. When Owen wakes the next day, his mom is much nicer!