Hi that's a good question which interests me too. Yesterday i was thinking about it. Well most of the dreams i can recall in the morning, i remember they were in colour and i think for me they are in colour every night. But I've heard about people who dream in Black and White. A guy who tried to dreamwalk into my dreams asked me before i went to bed if i used to dream in colour or black and white so I'm pretty sure there are people who have black and white dreams.
Hope that helps
Bye
Hope that helps
Bye
