I think that sleep paralysis is when people (mind) wakes up but body doesn't. The brain has a defense mechanism the paralyzes the body so it won't physically act what the mind experience in the dream and cause physical injury.
I wonder where they get melatonin from? Because if the body produces it... 😱
what do you mean by 'they'?
The people who extract or artificially produce melatonin.
since its chemical structure is has been solved, it's produced synthetically. I'm not sure if there are any natural forms on the market, but if there are, I would avoid them - they are extracted from the pineal gland of animals and may be contaminated.