ἐπ' αὐτὸν ἥκεις τὸν βατῆρα τῆς θύρας → you've come to the crux of the matter, come to the point, hit the nail on the head, you've come to the very threshold of the door, you are come to the very threshold of the door, you've arrived at the truth of the matter
In Greek mythology, Hypnos (/ˈhɪpnɒs/; Ancient Greek: Ὕπνος means 'sleep') is the personification of sleep; the Roman equivalent is known as Somnus. His name is the origin of the word hypnosis.