I Believe In Ghosts

What the heck? So I went back upstairs but I didn't go to my room, I instead tried sleeping in the room nearest to the staircase. I turned on a little light as I was scared. When sweet sleep finally descended over me, I heard a loud POP, but more like a small BLAST...
and I opened my eyes and the light was out, the one I keep turned on by default in the lounge was flickering. I stared at it until it stopped.