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human
Every couple of years, starting from when I was about 4 - 5 years old, I would wake up in the middle of the night and have this overwhelming fear of something unknown. So I would run to my mom's room and complain to her about how I was feeling and she tells me that I started spouting ludicrous, nonsensical metaphors and analogies to explain my experience. One of which was 'Two men are pushing a rock up the mountain and it keeps falling down.'... Whatever that means. 

This happened multiple times a year when I was a kid but has since stopped. I still experience it every once in a while though. Judging by what my mom told me, and what I remember about the experience, its more than just a little nightmare. Not only are you afraid when it happens, but theres also this feeling of dread like something is going to happen if you don't do something. And since I lack the ability to explain what I felt, I'm going to use an analogy. It feels like a feeling one would have if I was told to count every atom on earth... Pretty intense. I told my parents and my friends but everyone just shrugged it off as me having a nightmare but I know it's something else. So I tried searching the internet and I only found articles on sleep paralysis and night terrors which I know was not what I was experiencing. So, I just decided to define it myself.

Agnostimosis - A psychological phenomenon that occurs during the REM stages of sleep where one wakes up with an uncharted sense of fear but lacks the cognitive ability to explain it. Often times if another person is there, the experiencer will try to make up non-sensical analogies and metaphors in an effort to explain it, usually to no avail.

I made the word by combining Agnostos, which is 'unknown' in Greek, and Timor, which is 'fear' in Latin.


I would like to know if any of you have experienced what I'm describing.

TL;DR = sleep scare? me name. you have?
gpt
this is exactly the experience of night terrors, dude. The 'shouting non sensical explanations' bit is what the sense of being unable to reach the half-awake child from the other side. There's probably varying degrees of lucidity when in this half-waking state; for me I just remember being fixated on a very particular, urgent sensation that I couldn't quite describe. 
It's night terrors, you don't need a new word.