Hypnos

 

          Hypnos was a primordial deity in Greek mythology, the personification of sleep. He lived in a cave next to his twin brother, Thanatos, in the underworld, where no light was cast by the sun or the moon; the earth in front of the cave was full of poppies and other sleep-inducing plants. The river Lethe (the river of forgetfulness) flowed through the cave. He was the son of Nyx (night) and Erebus (darkness), while his wife, Pasithea, was one of the youngest of the Graces and was given to him by Hera. Hypnos and Pasithea had a number of sons called the Oneiroi (the dreams), who according to some sources were three in number; Morpheus, Phobetor and Phantasos.