Ghosts inside this building

So there are ghosts inside this building;

An eerie-looking hostel for us the naughties.

They will push the tables and lockers upstairs, 

Run on the floor and knock on my house's door

At 2 AM every morning, religiously.

Yesterday I encountered one spooky experience.

There was something running in front of my room

When everyone of us were sleeping soundly but me.

I knew there were nobody else awake because we 

Won't run like an animal at 2 in the morning.

So who was there last night?

Image source: http://caaaal.tumblr.com