My family has always had this problem. We can see and hear things that shouldn't be there. When I was very young my mom, sister, and myself lived in a small two bedroom house, it was always pretty creepy. At night I always had trouble falling asleep (I still do). Well later at night I would hear things, the fridge opening, foot steps in the hallway, weird things like that.
One night I got up to go to the bathroom and seen the fridge open, and no body there. I thought nothing of it and went about my business. Well through the time we lived there, things like this kept happening and as I got older I started to get freaked out, and one day I asked mom what it was, her response was "it's just papa". I was too young to remember papa, he passed when I was about 2. All of this happened until we moved when I was 12. I know papa was always watching over us because of all the other weird stuff that was happening at that house. His tool shed was pretty freaky, so much so I wouldn't go near it unless I absolutely had to. I have plenty of experiences to share about that and other things that happened when I was a kid. But hearing things is by far the scariest thing that happened to me there.