Nightmare On Oakwood St: Advice Needed

I share an apartment with 3 other girls at Eastern Michigan University. We live on the top floor.

I moved in about a week before the rest of my roommates and immediately I could hear noises from above. At first I thought that someone was living above me in some sort of attic because of how loud and frequent the sounds were. It was like footsteps and just general banging. But as I got more familiar with the building I realized that there is no way to get up there. I know some people may say that it must just be an animal, but the university inspects the buildings each year so I think it's really unlikely there would be an animal living up there.

As the school year has gone on, my roommates and I have begun noticing more and more things we cannot explain. When I am home alone, I often hear noises coming from my room when I'm in the kitchen, and vice versa. My roommate came home from a weekend away to find the pillows on her bed in a different position than she had left them. I know that nobody had been in her room because I had been home all weekend.

We also have heard on several occasions the doors open in the hallway we share with the other people on our floor, but there will be no footsteps or sound of anyone going anywhere. It's usually very loud when someone is walking through that hallway, so we have found this to be really strange.

We keep seeing shadows we can't explain out of the corner of our eyes, as well as sudden movements.

I think the most disturbing thing yet has been this: It was in the morning before it was light out. We have big windows in our stairwell facing out so that when you walk down them you can see your reflection. I was walking down the stairs and heard someone coming up the stairwell, so I looked in the window and saw a tall skinny man with blonde hair walking up the stairs around the corner but when I rounded the corner, there was nobody there. I had seen his reflection about 2 seconds before I rounded the corner so there's no way he could have gone anywhere. None of the doors in the stairwell had opened (you can hear them when they do because they are really heavy and they creak). I even went all the way downstairs to see if he had ran out of the building but there was nobody else around.

At this point, we are all pretty freaked out and we aren't really sure what to do. Whatever has been happening does not seem to have a negative energy associated with it but still it's been creeping us out. So if anyone has some advice it would be much appreciated.