Medieval Sufi “Instruction Manuals" are a genre replete with tales of divine and miraculous oneiric encounters: some holy men meet with Muhammad nightly; other saints sit at the footstool of God and receive direct revelations; still other sheikhs can visit the dreams of their disciples, instructing them in the fine details of Sufi praxis and theology. Rejecting a disenchanted modern ontology that views the Sufi dream as a "mere" dream or reduces it to the product of neurotic conflict, this paper engages in a close reading of several medieval Sufi instruction manuals in order to address the following questions: how do medieval Sufi masters understand the ontology of the dream-state? Is the dream-state an alternative realm, such as the Barzakh in the cosmology of Ibn Arabi, for example? Could we produce a cartography of the dream-realm, or map out Sufi sites of interest in this alternative plane of being? How would a Sufi go about "mastering" the dream state in order to enter into the dreams of lay-people, disciples, and even kings by their own volition? Finally, how can we understand Sufi conceptions of the dream within their larger medieval intellectual context? Broadly speaking, much of the pre-modern world shared a common set of assumptions about the veridical and divine nature of certain kinds of dreams. Moreover, this pre-modern consensus was rooted in a commonly-held set of Greco-Roman oneiric source-texts. In spite of the geographic distance between ‘Islamdom’ and ‘Christendom,’ philosophically their oneiric paradigms were rooted in the shared soil of classical antiquity. What were these shared source-texts, and can we trace their influence in Sufi dream-accounts?