Friend's freakiest ghost encounter...too bad he didn't record but I'm still scared?

I was on the computer late at night/early in morning (2 or 3am) when the battery operated toys started working. The lights flashed and the music on them played. I turned around and a little girl was playing on the floor. I said "why are you not in bed?" then i realized my son was at grandmas. the girl just smiled and disappeared. I have more.