If so, then the reason for this dream is that you are deeply afraid of the unknown and mystery represented by the cat in the dark, so when you dream that the cat climbed into bed, you subconsciously thought it was going to bite you. Black cat has always been a symbol of mystery, magic and even evil in western legends, so you think it is a black cat. But your subconscious mind automatically combines dreams with reality, so what you see in your dream is a white cat.