Mythology & Beliefs: Somnus For Somnus, See Hypnos.
Hypnos in Wikipedia
In Greek mythology, Hypnos (Ὕπνος, "sleep") was the
personification of sleep; the Roman equivalent was known as
Somnus. His twin was Thßnatos (Θάνατος, "death"); their mother
was the primordial goddess Nyx (Νύξ, "night"). His palace was
a dark cave where the sun never shines. At the entrance were a
number of poppies and other hypnogogic plants...
Somnus in Greek and Roman Biography and Mythology
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.) - A Dictionary of
Greek and Roman biography and mythology, William Smith, Ed.