Greetings Robert. I use eye mask while napping at afternoon or anytime when i try to doze when light is present (light presents a difficulty when i sleep - maybe i am sensitive to it ). Of late, i have been noticing that, apart from my real physical eyes being shielded from light, even my dreams are partially blind ( or i have difficulty seeing ). What could be the possible explanation to this ?. Please let me know what you think of this. Many thanks.