Creepy Day

Okay, I admit I did not get a lot of sleep last night due to the attic critters, but I have been fully awake and alert all day.  I did not imagine what happened.

This afternoon I was sitting in my office with the door closed tight so that my office would stay reasonably warm.  I had unlocked the door so that I would not have to get up if anyone came to visit.  There was a knock on the door and I said "Come in."  The door opened, but not all the way so I could see out but no one stuck their head in.  I thought it might be one of the little ones so I said "Come on in" and the door opened all the way, but no one was there.  I got up to see who might be in the hall or the main part of the building and there was no one there.  Very creepy.  I often see things in my peripheral vision that makes me think someone is outside my door, but this is the first time there was a knock and a door opening. I walked down to the other side of the building to see if I missed someone but everyone down there was accounted for and were not in a position where they could have run down to my office and created such a creepy feeling for me.  Plus I don't think any of them could run that fast.  We are talking seconds between the door opening all the way and me going into the main section of the building.

So I am already creeped out by the door opening and I get home and find a dead mouse next to my favorite chair.  A mouse that was not there this morning.  I have no poison or traps out for mice, and he was a fairly young looking mouse, so I have no idea what happened to him, or why he chose to die next to my chair.  

What message is someone trying to send me any way?