Ghosts, Spies, or Aliens- What Are They?

The Matrix movie tells us that our five senses are electrical impulses within the nervous system. Can these senses, which are in fact electrical impulses, be fooled into not picking up signals and cues in some way such as neuroprosthetic implants that tell the nerves to ignore certain stimuli such as a man who stays in your home undetected because his neuroprosthetic implant is programmed to interact with yours. If this hypothetical live-in stowaway knocked over a cup, wouldn't it appear that a ghost had done it? When my little sister experiences sleep paralysis and sees a man in the corner of the room, is she picking up low frequencies that aren't possible with a fully concious and alert mind? Think what the military could do with this type of technology if it existed and if it does secretly exist then where did they get it from; maybe the aliens? Maybe this makes for a good explanation for the possibility of invisibility. In my house growing up we were taught that entities do exist. Maybe they're not deceased ghosts, aliens, or fallen angels; but whatever they are that they really do exist. I'm not expecting anyone to take this post too seriously because my knowledge is extremely limited but I would like some feedback ASAP.

Maybe the answer to your ? is that they are what they are called. I'd guess that's a likely answer. They are real, imo. At least spirits are, anyway. Aliens and ghosts are things I have heard others say they have seen, and I believe them, though, I have never seen any.
But I have seen enough to convince me of spirit guides, or guardian angels, and an afterlife, a soul, and magic as all being real. They are in my world anyway.

I think invisibility is a very real possibility for mankind. I once heard that if you can imagine it then they've already created it.