The Oneiroi are figures from Greek mythology, representing dreams. They are often depicted as winged spirits who bring dreams to mortals while they sleep. The Oneiroi are said to emerge from a dark cave, where they reside, and deliver both good and bad dreams, influencing the dreamer's experiences. In mythology, the Oneiroi are sometimes associated with Morpheus, the god of dreams, who has the ability to take any human form and appear in dreams. The Oneiroi play a significant role in the ancient understanding of dreams, symbolizing the mysterious and often unpredictable nature of the dream world.