Personally I've seen orbs too. When I saw them they looked just like tiny clear lights that zip along at a good pace. The ones I saw couldn't be explained by "normal" sources. Other than a possible hallucination.
Carrie's right about deer. They make a strange call. It's very hard to describe the sound. I guess that's the reason why it's not on any Mattell toys. "The deer goes 'huurreeeee,hu,hu,hu'" =)
Well, at least the activity you're experiencing is pretty low key. Phantom cat's are pretty cool because you never have any kitty litter to pick up.
If you are not too scared about it try not to worry about it.