I bet its your eyes. If its not, then it could be something from another demension using that spot for a teleport type thing?
it might be, go into a dark room for a few minutes, the turn the light on and off quik and keep your eyes still, then a second or 2 later you will see a nice picture. scared me the first few times.
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i know exactly what it is, and it isnt spirits. it is an after image
of when you turn the light off, is your bathroom red or anything?
the reason for that question is whe you take red and invert the color, it is green, i get that effect all the time. its kind of annoying after awhile
if it isnt than im guessing you have aura vision and you didnt know it. the green stands for pure ki energy. the reason for the green is your reflection in the mirror, you see yourself which is engulfed in ki energy.
It could be my eyes over-adjusting to the dark while the light decreases to complete darkness GRADUALLY (because of light bulb) in less than a second, or adjusting to the expected darkness. They would have to adjust faster than the lightbulb dims.
I know it wasnt an afterimage because the blue-green light increased brightness after I turned my head.
Last night (but not today or any other day) every time I turned my bathroom light off, the room would get completely dark, then for about 1 second a blue-green light (I dont know where from, evenly spread through the bathroom) lit the bathroom. Then everything was completely dark again. I dont think this was my eyes playing tricks on me because its never done this before and it didnt do it 5 minutes ago.