Ever had a dream-like vision whle you're awake?

I had a very interesting experience the other day. When I got home from college I was was very tired and ended up laying down. With my eyes closed I started noticing these beautiful colors, I didn't think much of it though. It seemed then like these colors started to form images, and it was like I having a dream, although I was very awake. It was like everything was happeneing in a little corner of my brain and vision, and I could actually see the dream, without being asleep. Has anyone ever heard of this before?