This has only happened once but still, it freaked me out. I used to live in a flat in London above a shop. My bedroom was on one side of the flat and the kitchen and living room were on the other side, there was a staircase splitting it into two. There were no flats next to mine or any children living nearby.
It was about 5 o'clock in the morning and suddenly something woke me up. I couldn't really hear anything at first but about five minutes later I heard running footsteps outside the door on the staircase. I slowly sat up in bed and about 30 seconds later I heard strange echoey giggling.
I slowly walked to the door and burst it open. There was no more giggling or footsteps when I opened the door. I looked down the staircase and everything but there was nothing there. Has anyone else experienced something like this?