I'm not sure how to explain this, so I provided a picture. When I have very high contrasted color schemes in my dreams I wake up with heavy pounding headaches (right side pic), and when I dream in muted colors (middle pic) I don't have any issues. I usually don't dream in normal color (left side pic). My dreams have always been very detailed and I can remember 99% of them. I don't know if anyone else has noticed/have had this happen, but I thought I'd ask.