The Oneiroi were the immortals who travelled through dreams appearing as certain types of images. They were commonly shown as the sons of Hypnus. In some versions of the myths, they appear as gods, in others, as lesser beings.
- Morpheus - God of Dreams - Presents human images. Appears as a human.
- Icelos/Phobetor - God of Nightmares - Presents animals and monsters. Appears as wild animals, more often lions and bears.
- Phantasos - God of Fantastical Dreams - Presents earth, rock, water, and wood/nature like images. Appears as a woman.
- The Somnia in Roman Mythology