I was lying in bed last night and for some reason I imagined myself having a heart attack and dying. And I'm only in my early twenties 
The thought of it absolutely terrified me. I don't usually think about this kind of stuff, it just came out of nowhere. I then started thinking about an article I read about the fact that your brain still works after you die so you can still hear things. I think that is what put the most fear into me 