Shadows and Snakes

As promised, I drew the hallucinations I've had these two recent days. Sadly they aren't very noteworthy but I thought I would post them anyhow.

These are the creatures that dance around my room.

This is the first one. The most common hallucinations I experience are shadows moving around in my room; on the walls, the ceiling - everywhere, even when I close my eyelids they might still be there (that's why all the shadow beings, as I like to call them, are surrounded by red in this picture). You can see a pair of eyes near the top left in this picture, which is also something I see frequently whenever I close my eyes. A few times it's happened that I've seen faces of people I've never met or seen a photo/picture of. They just... kind of flash by my inner sight and it always happens so quickly that I soon forget how these mysterious people look like.
Under the eyes is a spider. I'm actually not afraid of spiders, but still these shadows appear in my room. In the middle is a group of people. I don't like crowds, and these people always seem to be staring at me. Close by to the group of people is a tiny bird, which might have something to do with the fact that me and Mary talk about birds a lot (or maybe more like she talks about them while I listen with interest). And to the far right seems to be a wolf or fox or some sort of canine.

Here's another picture which I drew yesterday shortly after waking up. I laid in my bed staring at the ceiling when slowly, these round/oval shapes began to appear. Soon I started to see oblong shapes moving between the round ones and realised that they were snakes - which I am in fact quite terrified of... but I still continued to lay perfectly still. I knew it was only a hallucination, so I had nothing to be afraid of, really.
The round shapes seemed to be more alive than the snakes actually; they kept expanding and contracting, almost as if they were breathing. I remember thinking about a fly's eyes and the scales of snakes when I watched the round shapes.
I drew this picture rather quickly, and I am not in any way a great artist but the point of these sketches isn't to be pleasing to the eye, but rather to record my hallucinations in a quick way when my memory is still fresh from the hallucination/while I'm still hallucinating. It's easier for me to draw these illusions instead of immediately start writing them down (which I can do later, like right now, while watching my sketches and reminiscing and therefore complementing the drawings).
Well, as said, I had just woken up and I drew rather quickly (do you know how frustratingly dull it was to draw all those circles?). After I was finished I soon fell asleep again and nothing more interesting happened. But there is one detail in this picture that piques my interest, and it's the fact that one of these circles have a cross in them. I noticed this odd circle later on but couldn't remember drawing it.
It's peculiar, and I wonder what it means? Perhaps it has something to do with snakes... I mean, I come across a lot of strange facts and whatnot on the internet and it wouldn't surprise me if I had once seen this symbol somewhere where it's been mentioned together with snakes, and my subconscious, such a wonderful thing, remembered this and added it to the hallucination. Or it might be something different all together, I haven't the slightest.