There are spaceships, maybe not aliens, but yes, ships that hardly anybody ever sees, could be human I suppose.
About people, they suck, they are very dark hearted beasts. So when you think that somebody is whispering or laughing at you they either are or would, you may just be aware of their being, what they are made of, what lurks inside of them, they even do it to their so called loved ones, if not out loud then on the inside where nobody seems to hear. Now, someone or something coming into your house and moving things around, this idea becomes a whole bunch more of a possibility when you are more aware of certain things, no one may actually be doing this but crap, with what some people know it makes it alot more feesible. Like I said, you may only be more aware than others. Computer operated, wow, you may be on to something there. This may just be just that in some way, perhaps not exactly a computer program, but in principle something just like it. I think that you are very smart, perhaps a little to smart, like so much that you can't support what ideas you are coming up with, perhaps someone or something is communicating with you, only in such a way that you are either not aware of it, or cannot understand what they are saying. In do time I suppose.