Yup, they're normal. Not related to BP. They can feel disturbing sometimes, but are not any kind of pathology. I've had a lot of them (mostly hypnopompic), and freaked when they started happening too. (As in... They're so REAL! I've even gotten up, so I know I'm not sleeping! Omg, I must be losing my mind!), so I'm happy to be able to share the comforting information that they're nothing to worry about.

I've seen bugs, people, giant heating systems(!), night sky through missing roofs, you name it. One memorable one was very pleasant though... a white feather gently drifting towards my face. Kinda cool.