John Wesley on Genesis 32:24

Very early in the morning, a great while before day. Jacob had helped his wives and children over the river, and he desired to be private, and was left alone, that he might again spread his cares and fears before God in prayer. While Jacob was earnest in prayer, stirring up himself to take hold on God, an angel takes hold on him. Some think this was a created angel, one of those that always behold the face of our Father. Rather it was the angel of the covenant, who often appeared in a human shape, before he assumed the human nature. We are told by the prophet, Hos 12:4, how Jacob wrestled, he wept and made supplication; prayers and tears were his weapons. It was not only a corporal, but a spiritual wrestling by vigorous faith and holy desire.