SECTUAL

First you have to learn to know when your in a bad dream , IT'S A DREAM, THIS CAN NOT BE REAL, PULL OUT!. You will briefly wake up. The moment you do, ROLL OVER. If your sleeping on your right side for example, roll over and turn over to your left side, or vice versa. It's like changing the channel your watching on TV!  A new dream will begin , like you switched a TV channel to watch something else.
IT WORKS!!!

Hmmm, interesting.

There are all kinds of possible reasons why this could work.

It should be studied.

Who'd want to get out of a bad dream? I like it spooky.