The prisoner, when he is asleep, does not know that he is in prison, he is free. The wretched is not wretched, he is contented; the sufferer is no more in pain or misery. This shows us that the soul is not in pain or in misery. If it were, it would also be so when the body is asleep. The soul does not feel the misery of the body and the mind, but when a person awakes then the soul thinks that it is in pain and wretched. All this shows us the great bliss of sleep.