Dreams are said to be the window to the mind. Through the study of dreams, we can catch glimpses into what our subconscious minds are thinking, or what is troubling us at our deepest levels. Not all dreams me the same, however, either in content or in meaning. In this respect, the study of bad dreams, nightmares, can yield interesting observations in regard to the mind and status of the dreamer. Indeed, nightmares appear to have been the subject of far more studies than more pleasant dreams, if for no other reason that while pleasant dreams are easily forgotten upon awakening, nightmares tend to linger in our minds is sufficient to demand attention. The sources of our dreams are most commonly attributed to factors in our waking lives. Whether it be emotional challenges, stress in the workplace, relationship problems or a myriad of other possible factors, the thoughts and feelings created in our waking environments are believed to directly influence the content of our dreams. A particular dramatic or traumatic experience during the day would no doubt be encountered again in some form or another during the night. Just as important as actual events in the determination of the content of our dreams are the preexisting beliefs that we hold. If we encounter some kind of phenomena in our dreams, it is very likely that we already believed in the possibility of the phenomena before the dream. For example, if someone dreams of being abducted by aliens, it"s very likely that, before the dream, he already believed in the existence of aliens. To the extent that dreams are direct reflections of our minds, they will reflect accurately what we believe and hold to be true. The way that we act in dreams bears consideration as well. Oftentimes, our behavior in our dreams reflects hidden desires for that type of behavior in our waking lives. Someone who dreams of revenge may actually desire revenge in real life, and likewise someone who dreams of adventure night after night may be experiencing his mind playing out a desire for more excitement in his everyday life. While the items encountered in our dreams are of great importance in the analysis of dreams, it must be recognized and understood that the same item in two different dreams can easily have entirely different meanings for the two dreamers. For example, a home in the dreams of an avid equestrian can signify comfort and relaxation, whereas the same home in the dreams of a hunter can represent excitement and challenge.
单选题
Nightmares are mentioned in paragraph 1 in order to______.