σπουδαῖον
From LSJ
νὺξ μὲν ἐμὸν κατέχει ζωῆς φάος ὑπνοδοτείρη → sleep-giving night hath quenched my light of life | sleep-giving night covers my light of life | night, the giver of sleep, holds the light of my life
Russian (Dvoretsky)
σπουδαῖον: τό
1) добро, благо Arst.;
2) тж. pl. серьезность, серьезные вещи Arst.