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
The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.