In the Gospel of Matthew the angel of the Lord works almost entirely in dreams. Joseph is told in a dream to take Mary as his wife, warned in a dream to flee to Egypt with the child, recalled in a dream when Herod dies, and redirected in one more; the magi are warned in a dream to go home another way. Scripture's angels elsewhere arrive waking, at Mamre, at the tomb, but Matthew's infancy narrative made the dream the angel's characteristic door, and Christian tradition has treated angelic dreams as a genuine channel of guidance ever since, while requiring discernment about what claims to come through it.
Islamic tradition holds dreams in comparable honour: the true dream is a portion of prophecy in a well known hadith, and the classical interpreters treated the appearance of angels in dreams as bearing glad tidings or warning, within a discipline of interpretation that ranked dreams as true, from the self, or from the adversary. Jacob's ladder, with its ascending and descending angels, gave both traditions the standing image of commerce between heaven and sleep.
The psychological schools translate rather than deny. The Jungian line reads angelic figures as messengers of the self, the psyche's own higher counsel personified, announcing what consciousness has not yet admitted; the popular dictionaries compress to guidance, protection and reassurance. The traditions differ on where the message comes from, and this atlas records each reading as its tradition's own.