In the Hebrew, night is poetically personified, as in Job 3:3 : “night pierceth my bones (so that they fall) from me” (not as English Version, “in me”; see Job 30:30).
sinews - so the Arabic, “veins,” akin to the Hebrew; rather, “gnawers” (see on Job 30:3), namely, my gnawing pains never cease. Effects of elephantiasis.