system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Reoccurring sleep paralysis, what is it and why does it happen?

I’ve read that most of the time hallucinations usually remain the same, but have been different each time, can this be explained? Also, can sleep paralysis be avoided or managed?
gpt
Theres a lot of activity going on in your brain as you sleep so your brain releases this chemical that stops you from moving so you don't hurt yourself. It usually happens only in a certain stage of your sleep cycle that you wouldn't notice it, if it's happening too often then your brain chemistry could be a little off. 

The first time it was scary for me too but then i started to play with it. Even on sleep paralysis you can control certain parts of your body like breathing. Try it next time to see which parts you can still control. Try breathing really fast then breath really slow.