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Etymology · Ancient Greek

ὕπνος

4 English words descend from Ancient Greek ὕπνος, most common first.

HypnosThe god and personification of sleep. The son of Nyx and Erebus, twin brother of Thanatos, husband of Pasithea, and the father of the Oneiroi. His Roman counterpart is Somnus.
hypnagogicThat induces sleep; soporific, somniferous.
hypnalislegendary asp said to kill people by making them go in an endless sleep or by attacking them in their sleep.
hypno-Related to sleep.