I wouldn't say it was a ghost, but something creepy has happened to me almost every night since year nine.
I've gotten used it though...
When I go to bed, I hear breathing next to me. It's not my own breath. I've held my breath, and it's also not consistent with mine - it's this harsh-ish uneven 'breathing'. I've also sat up in bed, and heard it next to me. It only comes at night though. Just as I'm ready to get in bed.
I have absolutely no idea what is. It gets pretty annoying though. I can't get to sleep. I've gotten my siblings to sit next to me and listen, but they don't pick anything up, and usually get freaked out by what I'm saying and leave anyway.