hmm
not a creature ... If you were asleep and you get shit scared by some demon that's your Guardian Alter preventing you from altering programming. If you were awake...it's a diff story. I need more details. were you high ?
yes i got scared in sleep, but didnt dream anything, im using half a pil remeron, its for insomniacs, but mainly used as antidepressant, side-effect can be vivid dreams, and i had some of those, but they mean no harm you wake up in middle of the night and see something like a creature covered in a black dress, face also covered, but that disappears immediately, you know its the drug. But it means no harm and totally different about what happened that night.
I remember that night i watched lots of demonic stuff on youtube, i believe i fell asleep and the video was still playing some jay''z songs rewinded backward 666 and stuff, didnt scare me at all, so i doubt i took that with me asleep.