"Thanatos or his identical twin Hypnos " (see related A | B | C | D | E | F | G | H | I | J | K | L | M), c. 32 BC Roman copy of a Greek Original Hypnos (Sleep) or Thanatos (Death) British Museum, London, England , UK

Discovered near Perugia in Civitella dArna.
Personifications of the twins Hypnos (slumber or reversible sleep) and Thanatos (irreversible sleep, thus, death), the sons or nurslings of Nix (Night), are relatively rare. This head is one of many versions of the same original.
In Hellenistic poetry Eros is associated with Hypnos (Sleep follows Love). Thanatos is merciful by being invisible, imperceptible and by rendering those facing death oblivious to their impending demise. 

Please see overview concerning sleep.

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