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First up: the broad basics of dreams.
首先：做夢的廣泛基礎
Dreams can transcend cultural differences. Past researchers have found that the most common dream themes were the same across different ethnic groups.
做夢可以跨越文化差異。過去的研究者一經發現，發生在不同種族的人身上的最普遍的夢境主題是相同的。
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.
最常見的夢的內容是什么呢？被追逐。牙齒脫落，車輛失控，飛翔，找不到廁所，這些情節占了最常發生的夢境內容的一半以上。
But dreams also have a darker side.
但做夢也有負面效果。
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援引一個先前的研究，就是把夢境主題與精神錯亂做比較。精神病患者的共同特點是，產生類似于夸張的，被迫害的或者宗教方面的幻想，這些內容在夢境中也極為常見。實際上，像“被跟蹤”和“成為名人”這些幻想，比起那些普遍的諸如掉牙和赤身裸體的夢境主題來說更加常見。
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在夢境的一個微小差異方面設計他的研究方式：規律性。什么樣的內容使我們夜復一夜反復夢到的呢？
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.
當這個研究在香港開始實施，有600多人加入進來。他們拿到一張包含78個夢境主題的調查問卷。受訪者回答他們是否從未夢到過這個東西，或者他們夢到過這個東西一次、兩次、三次或者更多次，是每年數次夢到還是每月一次或者更頻繁夢到。
