Can we change the life with the help of dreams?

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Recently I have been reading lot of books on the power of subconscious mind and phys-co-cybernetics. It is evident that the subconscious mind doesn't think or rethink, It purely depends on the direction from the Conscious mind to make decision. It also says from early life we get the influx of so much negative advises from our elders that most of subconscious power is wasted in it. It also says that it has power to completely change the individuals perspective in life and lead to success. There was an example where this lady has lost her eye sight. Despite repeated medical check-up and examination the Medical science told her that the cells and tissues have died and she won't be able to regain the eye-sight. But she had the firm belief, she started dreaming about the eye-sight. Told her conscience that she could see. After a month she started to see. The medical said it is impossible as her tissues and cells are still dead. But after 3 months when she went back to medical she could see everything. The cells and tissues were alive again!!!! What do you have your say on this. Is it really possible to change the life with positive and motivating dreams???