Access to hidden agencies could come through dreams. The dead or gods might appear in dreams, or a dream could portray an event that was later interpreted as being either auspicious or inauspicious. In order to interpret a dream or other portentous occurrence, one might consult a specialist, who could be a priest or, in a small community,l someone known to have the necessary insight.

P 171,
Society, Morality, and Religious Practice by John Baines (from Religion in Ancient Egypt edited by Byron E. Shafer)