I was just reminded of this thread last night in a not so pleasant way...
I went to bed early and fell asleep, and some time during the night, my boyfriend woke me up to tell me he saw a spider crawling on me. Now, he has night terrors at least once a week where he's convinced that he's seeing something in real life that actually isn't there. I had to get used to these two years ago so it doesn't phase me anymore - this is a very tame night terror for him. I just told him to go back to bed, as I always do.
But he insisted that it was real and he really did see it - again, I ignored this, because oftentimes his night terrors are VERY convincing to him. One time he woke me up in a panic because "a scorpion fell from the ceiling" and went so far as to ask for my phone as a flashlight and searched under the bed for it. There was no scorpion - we were in Maine, we don't have scorpions! - but he was frantic for a solid five minutes searching for that darned scorpion that he obviously never found. In the morning, he had absolutely no recollection of it. He never remembers his night terrors the next morning.
Anyway, he finally went back to bed, but at that point I was a little creeped out at the possibility so I threw that blanket off the bed and grabbed a new one. This morning, I asked him if he remembered his night terror, and he said "I told you, that wasn't a night terror. I hadn't even gone to bed yet. I walked in and there was a big brown spider that crawled from your shoulder to your feet." and then he holds his fingers about two inches apart for size. Time to wash all my blankets!!
Now if you want to talk about REALLY creepy... His actual night terrors have included screaming bloody murder that there was a guy with a gun in our doorway (too dark for me to see where he was looking), asking me in a terrifyingly calm way to please close the closet because there's a demon in there staring at him, and when we were living in college dorms, getting up and screaming whilst sprinting out of the room at 3 am down the hall into a totally different section of the building to the point I couldn't even catch up to him and others came out of their rooms to see what was wrong