In general:

If the dreamer is conscious of a want, perhaps this has to do with its basic nature. Maybe he has suppressed this desire in the waking state, so that wish comes in dreams to the surface.

Psychologically:

If person wants in dreams to do something else, than he is doing in his waking life, then he recognizes its potential to achieve success or to change his life. If you dream, that you live as a poet, even though you are working professionally as an actor, then it may indicate that you must explore your creativity in a different dimension.

Spiritually:

On the spiritual level dreaming of wants (wishes or desires) corresponds to the desire to request.

Traditionally:

European
– To have want (wish or desire) in dream: you will be satisfied;
– To fulfill wish or desire: you will find new friends.