I play the piano, as do my father and brother. We have a baby grand piano in our living room, which is right off our foyer. The foyer has the staircase leading upstairs, which is where my bedroom is. Last night, I can't be sure if I was awake or not, but I heard a piano key be pressed down, then something like a few clicks or footsteps or something. I remember shivering and pulling the covers over my head, and then getting up to use the bathroom. I usually cover my alarm clock at night because the light bothers me, so I did not know what time it was. Then, I lightly heard another key. The keys were the notes A (flat?) and C. (Look them up) I ran into my parent room, both of them were sound asleep. I ran into my brother's room, both were again, sound asleep. Nothing on the piano close to the keys was heavy enough to trigger a sound. My house has a burglar alarm, but we do not use it often. We live in a fairly safe neighborhood, and for all I know, the only robberies in my town were planned.
This was either early in the morning, or late in the night. Everyone but me was asleep.
I can't really be sure what this was due to the fact the no one else but my family was in my house.
I also saw a bright light after that, and it looked like my christmas tree lights were plugged in. Then, I blinked and they were gone.
I am also a writer of short horror/ghost stories and I wonder if my believing in the paranormal has something to do with this. No one else in my family believes in ghosts.