did you shift to this apartment recently ? hope its not haunted :( becoz this is what some people experience when the room or the place is haunted but if its not harmful then its safe only the thing is that some people can see them like u and some cannot may be you have that power where you can see them. whats Ur faith ? religion ? IN QURAN there are many prayers to be safe from them or when you see them you can read this prayers. take care bye