Somnus

the personification and god of sleep, the Greek Hypnos, is described by the ancients as a brother of Death (θάνατος), and as a son of Night (Hes. Theog. 211, &c.; Verg. A. 6.277). At Sicyon there was a statue of Sleep surnamed ἐπιδώτης, the giver (Paus. 2.10.2). In works of art Sleep and Death are represented alike as two youths sleeping or holding inverted torches in their hands. (Comp. Thanatos.) [L.S]

(Ὕπνος). The god of sleep; the son of Nyx (q.v.) and twin-brother of Thanatos or Mors (Il. xiv. 231; xvi. 672). With his brother, according to Hesiod, he dwelt in the eternal darkness of the farthest West (Theog. 759). Thence he swept over land and sea, bringing sleep to men and gods, since he had power over all alike, and could lull to sleep even Zeus himself. On the chest of Cypselus at Olympia, both brothers were depicted as boys sleeping in the arms of their mother, Death being painted in black and Sleep in white (Pausan. v. 18, 1). Sleep was represented in art in various forms and situations, and frequently with the wings of an eagle or a butterfly on his forehead, and a poppy-stalk and a horn, from which he dropped slumber upon those whom he lulled to rest. The earlier conception made Dreams the sisters of Sleep, but in later times the dream-god figures as his son. Hermes was also a god of sleep.