In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Darkness
If you dream you are in the dark you will be a little upset. If you are effortlessly walking in the dark then you will overcome any problem but if you are walking with difficulty then you will have upsets and and will have to get by without anyone’s help.