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First up: the broad basics of dreams.
首先：做梦的广泛基础
Dreams can transcend cultural differences. Past researchers have found that the most common dream themes were the same across different ethnic groups.
做梦可以跨越文化差异。过去的研究者一经发现，发生在不同种族的人身上的最普遍的梦境主题是相同的。
The most common? Being chased. Teeth falling out, losing control of a vehicle, flying and not being able to find a toilet make up about half of the most commonly recurring dream themes.
最常见的梦的内容是什么呢？被追逐。牙齿脱落，车辆失控，飞翔，找不到厕所，这些情节占了最常发生的梦境内容的一半以上。
But dreams also have a darker side.
但做梦也有负面效果。
Yu cites a prior study that compared dream themes to psychosis. Traits common in psychotic and schizophrenic patients, such as delusions of grandiosity, persecution and religion, are very common in dreams. In fact, delusions such as "being tracked" and "becoming a celebrity" occurred more prevalently than common dream motifs such as "teeth falling out" and the classic "being nude."
Yu援引一个先前的研究，就是把梦境主题与精神错乱做比较。精神病患者的共同特点是，产生类似于夸张的，被迫害的或者宗教方面的幻想，这些内容在梦境中也极为常见。实际上，像“被跟踪”和“成为名人”这些幻想，比起那些普遍的诸如掉牙和赤身裸体的梦境主题来说更加常见。
Next, Yu designed his own study on a slightly different aspect of dreams: regularity. What type of dreams do we repeatedly have night after night?
然后，Yu在梦境的一个微小差异方面设计他的研究方式：规律性。什么样的内容使我们夜复一夜反复梦到的呢？
Over 600 participants joined the study, conducted in Hong Kong. They were given a questionnaire which included 78 dream themes. Respondents then answered if they had never dreamed of the subject or if they had dreamed of it only once or twice, three times or more, several times a year or once a month or more.
当这个研究在香港开始实施，有600多人加入进来。他们拿到一张包含78个梦境主题的调查问卷。受访者回答他们是否从未梦到过这个东西，或者他们梦到过这个东西一次、两次、三次或者更多次，是每年数次梦到还是每月一次或者更频繁梦到。
