Did a demon speak to me?

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Hey guys I had a dream a few years back that was so horrifying and lucid I still remember it.
The dream began with me in a college lecture room. Full room. The professor was talking about entropy. While he was speaking about entropy I began hearing a scratching noise. Like bugs crawling. A mild fog fulls the room at this point. I cant really tell if theres anyone else in the room at this point. He begins on and says that all beings run out of energy eventually and die. Humans, plants, animal. None are safe. Then he went on to say even the universe will run out if energy. At this point the room is definitely completely emotry and the scratching noise is really loud. He then says he will witness the end of the universe. At that point the scratching noise became extremely loud. Basically white noise. He began to smile and it was so grotesque. A HUGE smile. i can only compare it to like the old trollface comics. The rokm turned to snow like you would see on a tv and the figure devolved into only a stick figure with its limbs growing and swiggling every where. I alt f4d at that point. Woke up out of breath.

What do you guys think? I wrote it off as like just a bad dream but i got to thinking about it again and there are other people who corroborate figures with large smiles who haunt their dreams.