When I wake up in the night, I see small gray spots all in my line of vision. At first I thought it was bad lighting, but it is still there when I turn the lights on. The spots don't seem to be in the air, they are on objects such as the ceiling and the wall. Last night it went away in a few minutes. The night before, it stayed until I went back to sleep. It was gone in the morning. Everything looks normal right now. Anybody have any ideas?