Dante Alighieri was an Italian poet of the Middle Ages. One of Alighieri’s more famous works, his “Divine Comedy" written in 1300, was based on sleep.
When Alighieri passed away in 1321, a section of the “Divine Comedy” script was lost. The portion of written work could not be found anywhere. Later, Alighieri’s son found the missing piece of transcript. When asked how he had located it, the son stated that his father had appeared to him in a dream and taken him to where the missing script was located. Upon awakening, he went straight to the place and discovered it to be exactly where his father had shown him in the dream.