Gil H. Renberg, Ph.D. (2003), who has taught at Harvard, Johns Hopkins and Washington University in St. Louis, is an American ancient historian and classicist whose work primarily focuses on the religious beliefs and practices of the Greeks and Romans, especially those revealed by material culture.

In this book, Gil H. Renberg analyzes in detail the vast range of sources for "incubation," dream-divination at a divinity's sanctuary or shrine, beginning in Sumerian times but primarily focussing on the Greeks and Greco-Roman Egypt.