John Chrysostom — as excerpted in the Catena Aurea on Mark 4:35-41

“(Hom. in Matt. 28) The Lord took the disciples indeed, that they might be spectators of the miracle which was coming, but He took them alone, that no others might see that they were of such little faith. Wherefore, to shew that others went across separately, it is said, And there were also with him other ships. Lest again the disciples might be proud of being alone taken, He permits them to be in danger; and besides this, in order that they might learn to bear temptations manfully. Wherefore it goes on, And there arose a great storm of wind; and that He might impress upon them a greater sense of the miracle which was to be done, He gives time for their fear, by sleeping. Wherefore there follows, And he was himself in the hinder part of the ship, &c. For if He had been awake, they would either not have feared, nor have asked Him to save them when the storm arose, or they would not have thought that He could do any such things.”