In ancient Greek mythology the god of dreams was Morpheus. His mother was Nyx, the night. Dreams where considered significant in ancient Greece. Like many other ancients, the Greeks assigned gods and goddess to the various principles of nature, in this case dreams where assigned to the character of Morpheus. https://www.ancient-origins.net/myths-legends-europe/morpheus-greek-god-dreams-who-delivered-messages-gods-mortal-world-002318