A Dream In Which My Mother's Reflection Was Completely Black In The Mirror

I had a habit of writing dreams in my diary, therefore I was doing so in my dream as well, and I was sitting with my brother, who was studying but not paying attention. In his notepad, I was also putting some answers for him to revise later. I then suddenly remembered that I had forgotten to write one dream in my diary, so I went to get it and a pen, and I asked my sister to keep writing answers in our brother's notebook, but she refused. As I was going to scribble down my dream in my journal, when I returned, I lectured my brother again for not concentrating on his studies. My mom then called my brother, who said yes, but I didn't let him leave because it was suddenly night time, and my mothar never called my brother for anything at this time, so I went to check and asked my mom if she needed anything, and she said no, and that she had put a dream journal beside her bad, which had now vanished. She was referring to my dream notebook, which she was attempting to find. I then looked in the mirror and saw that her image was completely black, revealing that it wasn't my mother, and whatever that thing was started getting out of bed and moving throughout the home, so I followed her and her dark reflection around the house.