[quote=Kaga]
Could be worse, I suppose. A friend of mine once got so sleep-deprived that we were talking and all of a sudden she froze, staring wide-eyed at something behind me. She claimed I was being stalked by Slenderman. Later that night, we were talking online and she told me her Christmas tree just exploded into a swarm of butterflies....So yeah moral of the story is, just make sure you're sleeping in the first place, I suppose.
[/quote]

Sleep Paralysis can also give you hallucinations.

But in that, you're paralysed, so if you see a pack of zombies about to feast on you, you can do jack shit besides try to move a finger and wake up.