There’s a biological reason, according to a national institute that researches dreams. The prefrontal cortex of the brain, responsible for logic and reasoning, is inactive during sleep, thus allowing all sorts of crazy images to evolve uncensored. And as your dreams are linking new memories to old ones, those associations often turn out to be a little kooky. Dreams use so many bits and pieces of our memory, but not in a logical, linear way. It’s more of an associative conglomeration of things. Still, while the associations sometimes seem unconnected, they might start to make sense. Or maybe not. Some of our dreams may be a haphazard mishmash of thoughts. In the same way that we have lots of silly, trivial, bizarre thoughts during the day, we shouldn’t expect all our dreaming thoughts to be especially profound. Some of it might just be nonsense. Hormonal changes, like those during pregnancy or the postpartum period, can also make your dreams crazy, as can some antihistamines and most antidepressants. A fever can also affect sleep and dreams, as can a stomachache, which is why some people believe spicy foods or eating right before bed causes wild dreams.

I had this dream about a devil it was weird

Like u said.. U probaly had a weird thought when u were sleeping or think about what u were thinkin when u went to bed...

Dreams are mostly just your minds way of telling you about things you may only be aware of in your subconscious. I dream all the time and most of the time they don't make sense. I use a dream dictionary to help me interpret the symbols in my dream. So if I had a dream about a king I would type in king to the dream dictionary and it would tell me what that means. I use www.dreammoods.com but the reliability of the dictionary differs person to person. Hope this is helpful.