Because: A dream is a succession of images, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep. During a typical lifespan, a person spends a total of about six years dreaming. Most dreams last only 5 to 20 minutes. (From Wikipedia)
Where Do Dreams Come From?.
And Why Do We Dream What We Dream?.
Does Anyone Know Why We Dream The Dreams That We Dream (???).
I use to dream of my time before I got ill. When I was young, healthy, had a lot of energy and good friends. I Hope I still have the oportunity to create a time like that again.
But it has something to do with, that I find it beatiful if the mind (and the body as well) is becoming healthy again, while we are dreaming. It makes a lot more sense in my head.