Magic Goose

Dream #2: Vintage shop. I think it's owned by an old friend. I find a cute shoe, but there's no sign of its mate. Mysterious toychest. I find a little goose inside.

source: by AndersenStudio

It is a wind-up goose. An old tune begins to play. I can somehow see the rotation of the tiny cylinder inside.

source: by Balakov

It amazes me that the mind can compose and "hear" an original melody during sleep. Why can't I do this in my waking life?