The prisoner, when he is asleep, does not know that he is in prison. He is free. The wretched is not wretched, is contented. The sufferer is not in pain and misery. This shows us that the soul is not in pain nor in misery. If it were, it would be so also when the body is asleep. The soul does not feel the misery of the body and the mind. When a person awakes, then the soul thinks that it is in pain and wretched. All this shows us the great bliss of sleep.