εὔπνουν

From LSJ

τίς δ' οἶδεν εἰ τὸ ζῆν μέν ἐστι κατθανεῖν, τὸ κατθανεῖν δὲ ζῆν κάτω νομίζεται → who knows if life is death, and if in the underworld death is considered life

Source

Russian (Dvoretsky)

εὔπνουν: τό приятный ветерок, прохлада (εὔ. τοῦ τόπου Plat.; ἡ ὥρα καὶ τὸ εὔ. Arst.).