Aliens, Ghost, or a Genetic Disease?

Let me start off by saying that this never happened to me. But it happened to my mom and my big brother.

When I was younger my mom would talk about the “blue light.” Of course it freaked me out and I had to ask her not to talk to me about it (I scare easily even as an adult!).

What she always told me was how a blue light would come into her room and she’d wake up frozen to the bed. But it never gave her a bad feeling- quite the opposite. Instead, it would fill her with good feelings. She called it her “angels.”

No one else ever saw it until my brother was spending the night on the couch and the blue light filled the hallway and woke him. Being frozen scared him extremely. He never really talked about it other than it freaked him out.

My neighbor used to talk about a similar happening when I was about 5 or 6. He said it was angels.

So what was it? Angels, aliens, ghosts, or some strange genetic ailment that my neighbor suffered from as well? I never saw any light, I think I would’ve died if I had, but it’s still something that lingers in my thoughts.