Matteo 8:24

And, behold, there arose a great tempest in the sea, insomuch that the ship was covered with the waves. But He was asleep.

The ship had been prepared by the disciples in accordance with previous instructions, and when He now entered, the men that stood nearest to Him, the inner circle of His followers, embarked with Him. Worn out by the intensity of the bodily and mental strain of a hard day's work, Jesus went off to sleep, soothed by the gliding motion of the vessel. All unexpectedly, with great suddenness, there burst down upon the little lake one of the storms which are so dreaded on account of their extreme violence.

There was literally an earthquake of the sea, a hurricane with tornado-like force, before which the experienced fishermen were absolutely helpless. The waves lifted up on every side, rising high above the ship, hiding it, breaking over it, gradually filling it with water, whose amount defied all efforts at bailing out. All nature was in an uproar, wind and sea had conspired to destroy both vessel and travelers.

Note the contrast: Christ was quietly sleeping, in the midst of all the turmoil, unaffected by an excitement which caused the strongest men to quake with fear. "But, now, natural sleep is the certain indication of a true, natural man. Since, then, the gospel says Christ slept in the ship, the evangelist wants to show us Christ as a real, natural man that has body and soul, and therefore had need of eating, drinking, sleeping, and other natural works that are done without sin, just as we have. In order that we do not fall into the error of the Manichaeans, who believed Christ to be a spirit, not a true man."