The origin of at night to indicate a point of time and the usage of prepositions in andat in olden times, when the time expression at night was originated, night might. 比较典型的是at bedtime, at breakfast time，什么时候睡觉、吃早饭并非一成不变的。 a communicative grammar of english 这本书上把at night也归为此类（虽然我个人认为这并不能. 在夜里 all night 整夜 every night 每个夜晚 into the night 入夜；直到夜里 good night 晚安，再见.
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