Scientists believe that while the nightmare may not directly correspond to waking life, it can reflect the sleeper's emotions or concerns.

　　他们认为噩梦不一定直接反映了现实生活，它有可能是睡者情感或焦虑的体现。

　　The five most common themes are falling, being chased, feeling paralysed, being late and the death of a loved one.

　　不停的下坠、被人追逐、在梦中吓得不能动弹、迟到、爱人的去世，这是噩梦中最常出现的5种情景。