Help in explaining a dream?

Again I find myself asking for help in explaining strange situations in my life. Last time was about a voice I heard during meditation which, thanks to my brothers and sisters, I discovered could have been just the transition phase between consciousness and sleep.

This time is about a strange dream, yet fearsome.
I will paste here what I've written on my journal, and if more informations are needed I will provide them.

I usually do not believe in supernatural events.
I mean, if we take in consideration the Force, it is something I can believe in as a metaphysical entity, much like the Will for Schopenhauer.
But I don't believe in supernatural events.

But I had a strange experience tonight, of which I intend on find a meaning, an explanation.

I'm talking about a dream, a fearsome one.

It was a normal dream at first, do not even remember what was it about, I only remember that all of sudden I found watching myself in a third-person like view, and an Alien had stabbed me in the mouth with what a can understand be some kind of a tongue (like the one of a Xenomorph from Alien), and it was "sucking out" my "soul", as a voice was telling me. I passed from a spectator point of view to watching again with my eyes, and as I was awakening and gaining consciousness I couldn't free myself from the image of that being devouring this spiritual energy from me. I immediately understood it was only a bad dream, and was trying to calm myself.
As a friend of mine told me, "fear is a product of thoughts, and I can choose to fear or not", but despite my efforts I still could not erase this scene.
I tried meditation, breath calming techniques, but it all felt useless. I started to calm down after one hour, trying to focus on the surroundings near me, especially the cars that were travelling in the road in front of my house.
And yet, I couldn't find any type of quiet rest.

Again, I don't believe in supernatural events, but I do know dreams are a reflection of our subconscious mind (thanks philosophy class, thanks Freud), and I intend to understand what in my subconscious mind changed to advice me in this way.

For what I know, it could be a device of my mind to alert me, it could be a vision from the Force (if I want to put it spiritually), it could be anything.

H. R. Giger trying to communicate!!!! Hehe, just kidding.

Your paleomammalian self having primacy in the dream state might have been transferring over to your more normal self as it approached waking, perhaps?

Of course I dunno, but when analyzing a range of options to find one preferred designation for something I like to start out at 'what could it be that is useful' to me. It's sort of like a safe harbour to revert to from any subsequent theories you might explore, which may be more distressing or distracting then hoped

But scarey stuff is scarey, and since you asked for help, my safe and useful interpretation of it would be to see my 'self' as not static and that the imaginary experienced was my future self trying to draw myself out of my past self. The first option is probably more likely but I don't like to bifurcate 'self' too much in the same time, so instead use time to see it as change. So the future self is less of the present nature and more of the consistent essence - but not to imply vision of the future, rather representation of it but in the absence of enough information about it to make it more realistic or in familiar terms. Religious iconography can work in that way, to inform incomplete representations into some role which can be related with - and the process of meditative and religious contemplation on deities can become anchored and accessible in dreams in that way, IMO.

The usefulness there might just be that it could be good evidence you've got enough power available in your dreams to extend high fidelity beyond yourself, but need to develop a framework to relate to external environments in such a way to enable greater freedom within your dreams. I use mathematical transformations to exercise distorting the dream space, a most simple one being a translation (of self, such as walking, running, driving, swimming, hovering or flying).

Adder wrote: H. R. Giger trying to communicate!!!! Hehe, just kidding.

From beyond the grave no less!

What is it about this dream that makes you feel it was supernatural and not just a scary dream because you had watched alien the day before or something? I don't see a supernatural component to it being described?

So I'm going to be a bit less philosophical here. I have really bizarre dreams sometimes, and practiced trying out lucid dreaming, so I jotted down notes from dreams. I realized that most anything in my dreams is a product of what's within my mind. I rarely ever dream about something totally foreign to me (e.g. most of my dreams have people I know in them, as opposed to making up completely new characters).
I also realized that certain things I eat or states of mind before bed heavily influence dreaming (have you ever had a malaria meds).
Try writing down what's in your dreams and jot down specific things you remember (i.e. a car you vividly remember from the dream) and compare it to things you'd seen the previous week or so. Then extrapolate what sort of memory artifacts were embedded in your dream. From my experience, if I found a conscious sort of "response" to dream behavior, and really internalized it, it trickled into my dreams.
I can't give any specific advice on xenomorphs stealing your soul, but you know better than I what the meaning is (subconsciously anyhow)

Tl;dr write it out or explain it out loud and see what clicks

I've specialized in dreamwork for a long while now, which doesn't try to "explain" dreams so much as work with them or through them in order to get deeper into one's inner landscape...so while I wouldn't dare try to interpret your dream, I can offer a few observations and places to start if you want to work with the dream. (There's a good overview of dreamwork theory and basics here: https://www.goodtherapy.org/learn-about-therapy/types/dreamwork#Dreamwork%20Training)

For me, the really scary dreams that I can't shake have often been some of the most worthwhile to unpack...the visceral reaction is usually a point that this is something I need to work on - my Dreamsource is trying to really get my attention. Probably the best advice I was ever given from a wise friend was to work it first as something within myself, unless it's physically tossing things around the house,in which case, if one wouldn't know how to handle that already, it wouldn't be the place to start learning I do note that you said a coupla times that you don't believe in supernatural stuff, so that would indicate to me that you're not leaning toward that interpretation anyway.

This dreams seems to be giving a pretty clear set of basic imagery - you are being shown a situation that is explained as something terrifying sucking out your "soul". (This kind of third person/voiceover is pretty common, and often really helpful in the dream landscape.) A good place to start would be to do some association on the alien figure - what does it remind you of? What are its features? What do you associate with those things? If you were describing it to someone who had never seen a movie like Aliens, how would you describe it? Anything that can get you going with observing the image and finding things about it that resonate with what you already know. Then question the soul part- what would you define as your soul? What is important about it? Once you get some good juicy material that way, plug it back into the scenario: what about [whatever is the strong association with the alien] threatens or drains your [whatever you identified as soul]? That often will get some good answers, and the exercise of examining it often makes the energy easier to deal with it.