Sri Aurobindo
Bases of Yoga
Bases of Yoga
These dreams are not all mere dreams, all have not a casual, incoherent or subconscious building. Many are 
records or transcripts of experiences on the vital plane into which one enters in sleep, some are scenes or events of the subtle physical plane. There one often undergoes happenings or carries on actions that resemble those of the physical life with the same surroundings and the same people, though usually there is in arrangement and feature some or a considerable difference. But it may also be a contact with other surroundings and with other people, not known in the physical life or not belonging at all to the physical world.
In the waking state you are conscious only of a certain limited field and action of your nature. In sleep you can become vividly aware of things beyond this field — a larger mental or vital nature behind the waking state or else a subtle physical or a subconscient nature which contains much that is there in you but not distinguishably active in the waking state. All these obscure tracts have to be cleared or else there can be no change of Prakriti. You should not allow yourself to be disturbed by the press of vital or subconscient dreams — for these two make up the larger part of dream-experience — but aspire to get rid of these things and of the activities they indicate, to be conscious and reject all but the divine Truth; the more you get that Truth and cling to it in the waking state, rejecting all else, the more all this inferior dream-stuff will get clear.