John Chrysostom

"God caused drowsiness to come upon Adam," the text says, "and he slept." It wasn't simply drowsiness that came upon him nor normal sleep; instead the wise and skillful creator of our nature was about to remove one of Adam's ribs. Lest the experience cause Adam afterward to be badly disposed toward the creature formed from his rib and through memory of the pain bear a grudge against this being at its formation, God induced in him this kind of sleep. God caused a drowsiness to come upon him and bid him be weighed down as though by some heavy weight.