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A. It's really hard to give an answer, since so much depends on yourself. Moreover, it's always risky to give or follow advice on what could be a serious problem from far away, and it's ultimately you who has to decide whether it is just a nuisance you want to get rid of, or if you really suffer from depressions or health problems and it is necessary to consult professional help.
The common "light" nightmares of permanently missing exams, falling or being chased can often be overcome with learning lucid dreaming (see section 6). Basically, if you learn to deal with them, they are not a problem anymore. Or, from a slightly different point of view, you're facing the problems that cause your dreams and thus overcoming them.
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