I don't think so. But the mythological theme of a distant country separated from the rest of the world by a non-trivial barrier (mountains, deserts, seas) is quite common (the Chinese have their stories about such a country in their West; the Christians later had a story about a certain Presbyterian John somewhere too...) . Anyway back to this 'Hesperia' (night) country, IIRC it is the topos of one of the 12 tasks (if I am not mistaken, the one in which Herakles must fetch apples from the tree given to Hera as a wedding present).