Friedrich Wilhelm Nietzsche. Human, all too human (№ 390447)

Wrong understanding of sleep. In the era of the rude, the original culture man believed that in dreams he will know another real world; here lies the beginning of all metaphysics. Without sleep people would have no reason to divide the world into two halves. The division into body and soul is also connected with the ancient understanding of sleep, as well as the assumption of an imaginary spiritual body, i.e., the origin of all belief in spirits and probably also of belief in gods. "Dead continues to live because he is living in a dream" - so infer once, many thousands of years in a row.