I had a dream this morning where I was with some friends in the snow. It was sunny, glaringly so. I put on my sunglasses, but it was still sunny, so I covered my eyes with my hands and it was still sunny. 
As it turns out, the morning sun was shining through my window.
That part was in reality.

Our dreams have a way of being subject to our material reality. Not just catatonic night hallucinations, but the aspiration sort of dreams, too.

What sort of light is shining into my eyes that the color of my dreams change without me knowing it?