system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we wake up before we die in a dream?

Or land when we fall, I guess.

EDIT: Guys, I am loving all the answers. Yes, I understand that its not always the case that we wake up, but I really appreciate all your explanations.
gpt
The most likely reason you wake up before dying in a dream is not because the dream will be over, but because you are so afraid, that it triggers an adrenaline rush. Your senses are heightened and you need to be awake to fend off whatever is about to kill you in your dream. Basically your mind tricks your body.