Hat man phenomenon. It's a very common sleep deprivation/sleep paralysis hallucination. It's actually pretty interesting, since it's only been common for a few decades, likely due to movies involving tall scary men with hats.
Madness string 111266
So far, not a single scientific model was even close to being 100% accurate at anything; but they worked. Our current models have things we can't explain or things that don't work - like that conservation of energy just doesn't apply to relativity, etc. We'll probably never have a complete theory of everything, but rather keep amending the models we already have with new bits to make them jive with newly collected experimental data, or just throwing stuff out and starting anew when we realize that we were completely off-track, or even, just being honest in admitting that we don't know something. And still there are people who can't get it. But every invention on history is a testament to someone showing an understanding of how things in this universe work, and applying our vast yet minuscule knowledge of stuff in general.