In other stories of the midrashim, Adam, in penance for his fall, abstains from sexuality for 130 years, but he is not able to control his nocturnal emissions; in his dream state female spirits, the succubae, come and have intercourse with him, and with Adam's seed they give birth to demons.
1981, William Irwin Thompson, The Time Falling Bodies Take to Light: Mythology, Sexuality and the Origins of Culture, London: Rider/Hutchinson & Co., page 19