Then I'm sorry for sounding mean, but the "but this felt extremely real" sounded like you were mocking my post!
I have almost similar dream as yours though not totally because in mine I didnt come to go up and walk outside but the feeling that some like rocks in your chest?yeah thats what I experienced a lot of times mate,there comes a time that I though seeing people around my bed and they seems talking while me is shouting but they cant hear me.as in shouting loud for them to recognize that I need some help to move ,until I finally carry to woke up and find out no ones near me but myself and I was only dreaming.some of my friends told me that it is some kind of near heart attacking process that I came to survive
What you're talking about I assume is something called "Sleep paralysis" and it's actually quite common!

Here's a link if you wanna read up on it:
https://www.nhs.uk/conditions/sleep-paralysis/ Thanks for sharing!
Ohh great,I have not cross about that article and I tell you this enlighten me now,lucky that I share mine here so you also share this Sleep Paralysis for me
Thank you Buddy this helps a lot