overnight  
adjective, adverb uk/ˌəʊ.vəˈnaɪt/ us/ˌoʊ.vɚˈnaɪt/
  (TIME OF DAY)      
 B1 一夜间(的);在夜间(的),在晚上(的)
for or during the night
  an overnight stop in Paris 在巴黎停留过夜 
 You can stay overnight if you want to. 要是你愿意可以住一宿。 
 Don't forget to pack an overnight bag (= a bag for things that you need when you stay away from home for a night). 别忘了收拾在外过夜的用品旅行袋。 
 - More examples
 - Several of the injured were detained overnight in hospital.
 - The temperature could fall below zero overnight.
 - I emptied the closet and put my belongings into the black overnight case.
 - I'm travelling overnight so I've booked a sleeper.
 - The overnight invasion took the military experts unawares.
 
  (SUDDENLY)      
C2 突然(的);一夜之间(的)
suddenly and unexpectedly
  She became a star overnight. 她一夜之间成了明星。 
 The book was an overnight success. 这本书一举获得成功。