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s. for example, it is inappropriate to present an umbrella as a gift to a couple because the word “umbrella” has the same pronunciation with another word separate in chinese.,白天需要清醒。找到更多的時間、更好的睡眠方法可能是個挑戰(zhàn)??茖W家已經(jīng)確認了80多種不同的睡眠紊亂癥(sleep disorders)。有些睡眠紊亂癥是遺傳的。但是,許多睡眠紊亂癥是由于熬夜,經(jīng)常跨時區(qū)旅行以及上夜班而引起的。our bodies want to sleep at night and be awake during the day. most women and men need between eight and