"Is it possible that Jesus simply fainted on the cross, and revived while He was in the tomb?"
Jesus had been whipped and beaten, and was bleeding from His head, back, hands, and feet for at least six hours. While he was on the cross, a soldier pierced His side with a spear and blood and water gushed out. Professional soldiers would certainly have completed their assigned task and ensured his death. "It is impossible that a being who had stolen half-dead out of the sepulcher, who crept about weak and ill, wanting medical treatment, who required bandaging, strengthening, and indulgence, and who still at last yielded to his sufferings, could have given to the disciples the impression that he was a conqueror over death and the grave, the Prince of Life: an impression which lay at the bottom of their future ministry. Such a resuscitation could only have weakened the impression which he had made upon them in life and in death, at the most could only have given it an elegiac voice, but could by no possibility have changed their sorrow into enthusiasm, have elevated their reverence into worship." Strauss, New Life of Jesus (quoted in Who Moved the Stone? by Frank Morison)