In Carl Jung's Memories, Dreams, Reflections, he recounts the vivid psychosis of one of his female patients, who believed that she had lived on the Moon. She told Jung a tale about her life there. It appears that the Moon people were threatened with extinction. A vampire lived in the high mountains of the Moon. The vampire kidnapped and killed women and children, who in consequence had taken to living underground. The patient resolved to kill the vampire but, when she and it came face to face, the vampire revealed himself as a man of unearthly beauty.
Jung makes a comment which could stand on the title page of this book: 'Thereafter I regarded the sufferings of the mentally ill in a different light. For I had gained insight into the richness and importance of their inner experience.'
Billion Year Spree, by Brian Aldiss. Corgi Books, 1975.