I’ve started sleeping with a blanket over my mirror. I often wake up in panic, stifling a yell because I see someone in my room.
I've heard that you should never look at mirrors in the dark. Without the light, your eyes have an odd glean of their own. It’s like they are reflective, shining from a light coming from somewhere else. Definitely don’t look behind you either, because the shadows behind you move closer to the glass.