A What would be the effect of staying up late?
B The number of people who tend to stay up late is increasing, whether teenagers or adults. The main reason for them is that they have something didn't finish on the day.
C Staying up late will have negative effect.
A (1) The lack of sleep will effect people's healthy
(2)If you didn't get as much sleep as you need, you will be tired during the day and have no spirit to do anything
B (1)Staying up late will influence the work efficiency of the next day
(2)If you don't finish the day's tasks,you will have more things to do in the evening.
A Staying up late will effect people's healthy, work efficiency and you will feel very tried during the next day.