Incubation (temple sleep) was a well-known ritual in the Near East and became increasingly popular in Classical and Hellenistic Greece, becoming attached to Asclepius and other divinities. It flourished in the Eastern Mediterranean, where it was encountered by the emergent Christianity. Temple sleep was so widespread that it was impossible to ban. The Christianization of the incubation ritual was thus a detailed and lengthy (but successful) process that encompassed several aspects of the Church's self-definition, including important social and theological issues of the era. The list of relevant issues is extensive: the fate of Greek temples and the reinterpretation of sacred space, confronting Hippocratic medicine, and the learned Greek intelligentsia. Since disease and a search for cure is a ubiquitous human need, the early Church embraced a healing ministry, in secular terms as well as in ritual healing. Incubation records show how the Church viewed dreams, conversion, or the notions of magic and divination. All these come within the framework of writing miracles: the transformation of the cult was thus incorporated into standard Church discourse, from ritual practice to proper literary genres. This first comprehensive monograph on Christian incubation examines the rich material of all the relevant Greek miracle collections: those of Saint Thecla, Cyrus and John, the different versions of Saint Cosmas and Damian and saint Artemios, as well as the minor incubation saints, As a result, it unfolds the transformation of healing sites and practices related to dreams as they spread across Byzantium, from rural Asia Minor to Constantinople and Alexandria.