Oneiroi (Dreams) 
 
The Oneiroi or Dreams were the children of either Nox (Nyx), the goddess of night, or Somnus (Hypnos), the god of sleep. The Oneiroi were Icelos or Phoebetor, Morpheus and Phantasos.

All three gods had the ability to assume various forms. Morpheus could assume form of human, while Phoebetor can transform himself into any animal. Phantasos, however could only assume shape of inanimate objects, such as rocks, trees and water.

The Oneiroi dwelled at the entrance of the Underworld. They had the ability to change shape.