I was staying at my best friend's newly built house a couple of years ago; we were down stairs playing on the computer in the basement. She told me she had to use the bathroom and she would be back soon. I stayed down stairs still playing the game.
A few seconds after I heard her go upstairs, I started hearing movements behind me. She had four cats and an ornery little brother, so I immediately thought the noises were one of those. I heard more noise and I turned around and called out her brother's name thinking he was trying to trick me; it was too dark to see. No answer. I kept up with my game. The hair on the back of my neck stood up and I felt a breath on my neck and heard the loud hard exhalation to go along with it. I immediately froze and cocked my head, protecting my neck. I ran like mad up the stairs, tripping over a few, and to the bathroom door and started banging on it until she let me in. After I told her she what happed, we went to her brother's room, and he was asleep in his bed. I was so terrified.
Not only did this happen once, but two times on two different occasions when I had spent the night. The same breath and sound I heard and felt. The same spot I was sitting in and at about the same time at night (in the early am hours) Needless to say I didn't stay in the basement alone any more.