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It has nothing to do with chemicals (it does, but not to that extent)
A person can always increase his/her level of awareness and control. One way, is to focuse on your hands and rub your hands together.
Im aware that you can increase control by rubbing your hands but thats not exactly the most scientific and indepth analysis of dream control ive ever read :p .. Studies seem to show that the levels of serotonin and norepinephrine in the brain directly affect judgement and control in dreams and i was simply stating that this would be my guess too... soooo it probably does have something to do with chemicals. Whether certain actions in dreams would rouse the brain into increasing the levels of these chemicals in dreams is another question, but it seems to be so, just like actions and thoughts in waking life change the chemical balance in the brain.