Then the mariners were afraid, and cried every man unto his god, and cast forth the wares that were in the ship into the sea, to lighten it of them. But Jonah had gone down into the lower part of the ship; and he had lain down, and was fast asleep.
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Haimo of Auxerre
he slept because he was overcome by weariness, just as we also read that the Apostles, overcome by sorrow, were pressed down by sleep in the Passion of the Lord (Mk 14:37-41).