Camera working again

I finally got photos with the motion activated camera. Unfortunately there was nothing unusual unless you consider that most of the pictures are either black or just show an empty room. The camera ran for about 24 hours. It had about 50 shots. Many must have been taken at night when no lights were on as they were black. But if it was too dark to see anything; what activated the camera. We got lots of pictures of the front portion of the parlor but nothing that should have activated the camera. And we got a few shots of me setting up the camera or my passing through the room. I reset the camera more toward the front of the parlor; however, my wife wants me to aim the camera up the front staircase because that is where we managed to get our only "ghost" photo some months back. That staircase is rather dark so I'll have to leave the hall light on. So tomorrow I'll see if I can set the camera to keep tabs on the front stairs.