Genesis 32:17-21

Genesis 32:17-21. And he commanded the foremost, saying, When Esau my brother meeteth thee, and asketh thee, saying, Whose art thou? and whither goest thou? and whose are these before thee? Then thou shalt say, They be thy servant Jacob’s; it is a present sent unto my lord Esau: and, behold, also he is behind us. And so commanded he the second, and the third, and all that followed the droves, saying, On this manner shall ye speak unto Esau, when ye find him. And say ye moreover, Behold, thy servant Jacob is behind us. For he said, I will appease him with the present that goeth before me, and afterward I will see his face: peradventure he will accept of me. So went the present over before him: and himself lodged that night in the company.

But in the middle of the night, he was in such deep anxiety concerning his meeting with his brother, and probably still more concerning his position towards his God, that he felt that he must get away alone to pray.