I am only 16, but I have experienced paranormal happenings for, well, pretty much as long as I can remember. I am the oldest of three kids with happily married parents, so I don't believe that stress or being upset is to blame for these events. We live out in the country by a small town on a nice little farm, so again I doubt my imagination is to blame for this.
The first sign of activity I can remember occurred when I was about five or six years old and we lived in our tiny trailer. My dad and little brother always used to be the first ones up and immediately my dad would put the TV on. It was sometime in winter when the mornings were still really dark. I woke up, hearing the TV on and decided to get up. I went to the dark living room hearing the TV through the hallway only to arrive and find it was not on. I thought nothing of it and went back to bed, only to hear it loud and clear again. This continued for awhile, I believe it stopped when we bought our new house.
One of the things that freaks me out the most is when our cats react to things I can't see. I often let them sleep in my room because they make me feel safe at night, because I feel watched when I know that I'm alone. This happens the most in the evenings when I practice piano. It gets so bad sometimes that I can see the distinct shadow of a person in my peripheral vision, but when I turn to look, they're gone.
Things of mine disappear randomly after I've set them down and reappear in places I've searched for, but didn't find the item. Some of the more common events are when I hear someone call me, only to find out that no one did.
My friend on many occasions has slept over and had these things happen to her as well. A few of the weirder times involved my stuffed animals. We were about to go to bed, but I'd forgotten my stuffed animal somewhere. We searched the whole house, finding nothing, so we went to bed (after my family).
The next morning, the stuffed animal was right in the middle of the floor in plain site. We asked everyone, but no one had come into my room that night, also considering the fact that my door has a loud creak that can wake my sister (who sleeps across the basement from me) up, we were really creeped out.
The second time involved a Teddy bear with creepy eyes. I felt that they were staring at me, so I chucked it off my bed, and my friend and I went to sleep. I woke up suddenly, feeling scared, only to see that Teddy bear with its eyes inches from my face, like it was staring me down.
The freakiest of these sleepover events happened one night when we stayed up particularly late talking, too awake to fall asleep. I have this huge comforter; it was perfectly equal on both sides, so there was no way it could've fallen off. It was suddenly ripped right off us and under the bed! We were terrified, but I snatched it back from under the bed with a little bit of resistance.
Those are just a few of the things that have happened to me. There are far scarier and more unusual events that I haven't listed because I didn't want this to be super long. We were not dreaming and I was not the only one who experienced it, so I believe it was ghosts.