Then thou scarest me - This is an address to God. He regarded him as the source of his sorrows, and he expresses his sense of this in language indeed very beautiful, but far from reverence.
With dreams - see Job 7:4. A similar expression occurs in Ovid:
Ut puto, cam requies medicinaque publica curae,
Somnus adest, soliris nox venit orba malis,
Somnia me terrent. veros imitantia casus,
Et vigilant sensus in mea damna mei.
Do Ponto, Lib. i. Eleg. 2.
And terrifiest me through visions - See the notes at Job 4:13. This refers to the visions of the fancy, or to frightful appearances in the night. The belief of such night-visions was common in the early ages, and Job regarded them as under the direction of God, and as being designed to alarm him.