This is a question I've asked myself before since I'm rather focused on symbolism and like to analyze my own dreams. There's nothing concrete to dreaming, science still doesn't why we even dream, so any kind of conclusions drawn is going to be mostly belief. Usually my dreams are manifestations are my fears or expressions of negative things that have happened to me i.e. feeling betrayed. I don't think I'd base any huge decisions based on a dream but I wouldn't be able to make the decision without taking the dream into account