It means your neurochemistry is disturbed. REM is the only time of the day, when stress-related neurotransmiters (particularly noradrenaline) are absent. read more
If you dream something it may mean that your subconscious is trying to make you aware of your feelings. So, in order to understand your dreams, and why you have nightmares so many times, you have to analyze your feelings and then your dreams. read more
The researchers then classified and analyzed the narratives of about 10, 000 dreams: 253 of which were nightmares and 431 bad dreams. Roberto and Zadra distinguished nightmares from bad dreams by what the dreams contained. “Physical aggression is the most frequently reported theme in nightmares,” the study found. read more