Morpheus is spoken of in the Metamorphoses of Ovid. He sleeps on an ebony bed in a dimly lit cave, surrounded by poppy flowers. Ovid suggests that Morpheus has a special talent for mimicking human form in dreams. According to Ovid, Morpheus concentrated on the human elements of dreams, his brothers Phobetor and Phantasos being responsible for animals and inanimate objects, respectively.
Morpheus sends images of humans in dreams or visions, and is responsible for shaping dreams, or giving shape to the beings which inhabit dreams. Phobetor made fearsome dreams (etymologically related to “phobia” from the Greek “fear”). Phantasos produced tricky and unreal dreams (hence “fantasy”, “phantasmagoria”, etc.).