προσέχειν τὸν νοῦν
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
Greek > English (Woodhouse)
heed, mark, note, notice, apply one's mind to, attend to, bestow attention, pay attention to, pay attention