There are as many different opinions for interpretation of dreams as there are people that do it. It depends on who you ask.
The mechanism of why we dream is not fully understood, by anyone. That it is a function of the sub-conscious is fairly well agreed upon but there are many theories as to why and how we dream.
People have different solutions with the conscious mind when presented with the same data, it is far more difficult to explain the functioning of the unconscious one.
It is, however, a practical certainty that there is no pre-cognition involved
A different response:
A black shadow is usually regarded as representing an unknown threat. Dreaming about a black shadow is not likely to foresee the future but probably refers to something in the dreamer's present life that feels vaguely uncomfortable or dangerous.
You watch too much television.
if you see your shadow it means you blocked a light ray
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It means that if you do not have ambition for what you wish to came true. It will merely be only a dream.
Ghosts
Your dream suggests that you have a void or empty space in your life.
nothing
bad luck
It makes sense. Shadow is black, so Shadow the Hedgehog is black.
The image of an evil shadow with the Crow on its head appears to be drawn from the recent film the "the Lone Ranger," with the Johnny Depp character wearing a Crow on his head (2013.) The black evil shadow in your dream represents something that you find both frightening and somewhat mysterious and appealing, like that Johnny Depp character. It might represent your feelings toward a dangerous habit such as drug use, or it could be that you are both attracted to and repulsed by some person in your life.
When everything goes black in a dream means nothing other than the dream is ending and your mind is passing into a different stage of sleep.
The cast of Shadow Dream - 2005 includes: Stuart Ziegler as Gregoire