THE DREAM I was taking giants steps on the moon in an astronaut suit.

THE REALITY When the dreamer woke up from the dream the Police song "Walking on the Moon" was playing on the radio.

DREAM INTERPRETATION Often our dreams are shaped by external sources. This is one obvious case. We can hear perfectly well in dreams and such sources will shape our dreams. Such dreams are often difficult to interpret. What parts are part of dream world and what parts are simple noise interference.