On Divination in Sleep (orOn Prophesying by Dreams;Ancient Greek:Περὶ τῆς καθ᾽ ὕπνον μαντικῆς;Latin:De divinatione per somnum) is a text byAristotle in which he discussesprecognitive dreams.

The treatise, one of theParva Naturalia, is an early inquiry (perhaps the first formal one) into this phenomenon. In his skeptical consideration of such dreams, Aristotle argues that, although "the senders of such dreams should be the gods," it is nonetheless the case "that those to whom they are sent are not the best and wisest, but merely commonplace persons" (i, 462b20-22). Thus, "Most [so-called prophetic] dreams are, however, to be classed as mere coincidences" (i, 463a31-b1).

• Works related toOn Prophesying by Dreams at Wikisource
• English translation by J. I. Beare
• Parva Naturalia public domain audiobook atLibriVox
• Greek text ed.W. D. Ross available in HTML format viaGreco interattivo (Link not functioning).
• Greek text available onGreek Wikisource.

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