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