Paranormal? Unexplained? Am I going crazy?

Thinking you see things out of the corner of your eye is perfectly normal - your peripheral vision is very unreliable. If you're hearing creaking noises, it's coming from somewhere. I'm glad you got up and checked - since no one was there, it's probably the house settling or the floor expanding/contracting from changes in humidity and pressure. It sounds like you've been talking about this where your kids can hear you, and they've started making up similar stuff. That's normal for kids their age. Shadows some from somewhere - maybe a ping car cast a shadow of something in your room on the wall. If the Wii power keeps coming on, there might be something wrong with it. Sounds like you're ociating a lot of random things that aren't related in the hopes you can conclude there's a ghost. But the fact is, there's no evidence at all that ghosts exist. And you don't have any. The last thing you mentioned is called the confirmation effect - you remember when you see those numbers and forget all the times you looked and didn't see them. Again, perfectly normal brain function, but often mistaken for the paranormal.