One example is the dream of Thutmosis IV: He fell asleep under the Sphinx which was covered to the neck in sand. Thutmosis had a dream that the Sphinx spoke to him and promised that if he would clear the Sphinx, Thutmosis would be destined to become king of Egypt.
Thutmosis cleared the Sphinx, became king of Egypt and
erected a stela between the paws of the Sphinx.
Sphinx and dream stele of Thutmosis IV
Dream of Thutmosis IV
The strong belief in the prophetic power of dreams is also found, for
example, in Xerxes. Herodotus recounts his three dreams, which led him
to continue the military crusades of his father Darius against the Greeks.