Sleep hallucinations?

As you may know, I have a recurring sleep hallucination. Actually, I don’t know the correct term for it, but that seems to come close. I’ll wake up in the middle of the night convinced there are spiders in my bed, on the walls, etc. As I stay awake, that idea fades and I’m eventually able to go back to sleep.

Last night was something weirder. I woke up and was convinced that there was an old woman in the bed with me, asleep. She had white hair and white clothes and was curled up in the fetal position. After an initial freakout, it looked like she was still there. I made myself get up, go to the living room, and look out the window until I calmed down. Then I walked back into the bedroom and there was no old woman there, just Andy. I went back to sleep.

It’s probably a new flavor of anxiety dream, keeping me from getting a decent night’s sleep of course. WTF?