Why does the human body jerk/shock itself awake sometimes while trying to sleep?

Question

Why does the human body jerk/shock itself awake sometimes while trying to sleep?

In: 2959

Answer 1

Brain going to sleep check list.
~~1) No threats near by~~
~~2) No foreseeable threat~~
~~3) Not too cold/hot~~
4) Turn off the part of the brain that checks for threats
~~5) Get feel good chemicals to encourage sleep as a thing we want to do in the future~~
~~6) Get the paralysis chemicals so we can stop feeling the environment and turn off the rest of our brain~~
OH MY GOD WE”RE FALLING! THERE’S A THREAT! UNPARALYIS UNPARALIS!