I have a 9 year old sister,she claims she sees a grey or black mist at the corner of her eye a lot,but looks like a person in a corner of a room wrapped up holding on to their knees crying.She also says she sees "Shadow People" when she is trying to sleep.I tell her to stop joking but this has actually been going for a long time now,like since she was 6 years old.Our parents and I can't see them but she can."There are also weird whispers or popping noises too!"she says.Im So CONFUSED!