9 “And after that He says unto them, Our friend Lazarus sleeps; but I go, that I may awake him out of sleep.” It was true what He said. To his sisters he was dead, to the Lord he was asleep. He was dead to men, who could not raise him again; but the Lord aroused him with as great ease from the tomb as one arouses a sleeper from his bed. Hence it was in reference to His own power that He spoke of him as sleeping: for others also, who are dead, are frequently spoken of in Scripture as sleeping; as when the apostle says, “But I would not have you to be ignorant, brethren, concerning those who are asleep, that you sorrow not, even as others who have no hope.” Therefore he also spoke of them as sleeping, because foretelling their resurrection.
And so, all the dead are sleeping, both good and bad. But just as, in the case of those who sleep and waken day by day, there is a great difference as to what they severally see in their sleep: some experience pleasant dreams; others, dreams so frightful that the waking are afraid to fall asleep for fear of their recurrence: so every individual sleeps and wakens in circumstances peculiar to himself. And there is a difference as to the kind of custody one may be placed in, who is afterwards to be taken before the judge.
For the kind of custody in which men are placed depends on the merits of the case: some are required to be guarded by lictors, an office humane and mild, and becoming a citizen; others are given up to subordinates; some, again, are sent to prison: and in the prison itself all are not thrust together into its lowest dungeons, but dealt with in proportion to the merits and superior gravity of the charges. As, then, there are different kinds of custody among those engaged in official life, so there are different kinds of custody for the dead, and differing merits in those who rise again. The beggar was taken into custody, so was the rich man: but the one into Abraham's bosom; the other, where he thirsted, and found not a drop of water.
Source: Tractates on the Gospel of John (New Advent)