Everyone dreams. It's just a matter of memory of those dreams, not whether they occur or not. A person's body is not just relaxed during REM, it is almost paralyzed. The reason being that you'd act out your dreams otherwise. I watched a documentary where they blocked sleep subject's from receiving the paralyzing message. They sat up with eyes open, talked, smoked looked for all the world like they were aware, but their brains were asleep. None of them remembered anything until they were shown the videos. The sleep researchers in the documentary now think that REM sleep is a survival tool used to experience dangerous situations and try different methods of solution in a non-lethal, matrix-like simulation. A simulation that is so real to the brain that the body must be immobilized. I thought that was pretty cool.