While I was dealing with severe vertigo a few years ago, I woke up in the middle of the night.

I forgot that I was dealing with vertigo and immediately begin to stumble in the darkeness. I needed to turn on the lights but I felt I was about to fall and crash bodily into the wall. I had to prevent the fall. I quickly leaned against the wall for support. During these few seconds, I see bright spots form rapidly in a cluster and begin to spin with ever increasing speed. I was able to reach the light switch and turn on the lights. The spots and spinning subsides until my vision is normal once again.