I don't think it's the devil trying to tell you something. For a start, there are six billion plus people on the planet, and the devil's not an infinite being... I imagine he has to prioritise his time like anyone else. If he's going to be trying to talk to anyone it will be the Pope or a world leader or some such. (I'm not being flippant, I genuinely believe that.) I know you could argue it's some lesser demon, but again, I don't think so. Demons don't like to draw attention to themselves, because what person would trust them?

It's more likely your brain throwing up images in a pre dream state. I get them too, and sometimes they can be quite alarming, or just plain random (a red cup with a half eaten apple in it? What was that one about?) Just accept it as your brain hiccuping, and don't worry too much about the devil.