1.
"But in the world of dreams the soul sees when the eyes are closed. The man is seemingly dead, lies there as dead; the ears do not hear, yet he hears. The body lies there, but he—that is, the soul—travels, sees, observes. All the instruments of the body are inactive, all the functions seemingly useless. Notwithstanding this, there is an immediate and vivid perception by the soul. Exhilaration is experienced. The soul journeys, perceives, senses. It often happens that a man in a state of wakefulness has not been able to accomplish the solution of a problem, and when he goes to sleep, he will reach that solution in a dream. How often it has happened that he has dreamed, even as the prophets have dreamed, of the future; and events which have thus been foreshadowed have come to pass literally. Therefore, we learn that the immortality of the soul, or spirit, is not contingent or dependent upon the so-called immortality of the body, because the body in the quiescent state, in the time of sleep, may be as dead, unconscious, senseless; but the soul, or spirit, is possessed of perceptions, sensations, motion and discovery. Even inspiration and revelation are obtained by it."
-Abdu'l-Bahá, from a talk given in Washington DC in November 1912, The Promulgation of Universal Peace
2.
"The other manifestation of the powers and actions of the spirit is without instruments and organs. For example, in the state of sleep without eyes it sees, without an ear it hears, without a tongue it speaks, without feet it runs. Briefly, these actions are beyond the means of instruments and organs. How often it happens that it sees a dream in the world of sleep, and its signification becomes apparent two years afterwards in corresponding events. In the same way, how many times it happens that a question which one cannot solve in the world of wakefulness, is solved in the world of dreams. In wakefulness the eye sees only for a short distance, but in dreams he who is in the East sees the West: awake he sees the present, in sleep he sees the future. In wakefulness, by means of rapid transit, at the most he can travel only twenty farsakha an hour; in sleep, in the twinkling of an eye, he traverses the East and West. For the spirit travels in two different ways: without means, which is spiritual traveling; and with means, which is material traveling: as birds which fly, and those which are carried.
In the time of sleep this body is as though dead; it does not see nor hear, it does not feel, it has no consciousness, no perception: that is to say, the powers of man have become inactive, but the spirit lives and subsists. Nay, its penetration is increased, its flight is higher, and its intelligence is greater. To consider that after the death of the body the spirit perishes, is like imagining that a bird in a cage will be destroyed if the cage is broken, though the bird has nothing to fear from the destruction of the cage. Our body is like the cage, and the spirit is like the bird. We see that without the cage this bird flies in the world of sleep; therefore if the cage becomes broken, the bird will continue and exist: its feelings will be even more powerful, its perceptions greater, and its happiness increased. In truth, from hell it reaches a paradise of delights, because for the thankful birds there is no paradise greater than freedom from the cage. That is why with utmost joy and happiness the martyrs hasten to the plain of sacrifice.
In wakefulness the eye of man sees at the utmost as far as one hour of distance..."
-Abdu'l-Bahá, Some Answered Questions
Posts
