九点半了，你该睡觉了。 用英语怎么说

最准确的是用It 's time to go to bed.It's nine o'clock.
It 's time to do sth 是时候干什么。。。

It's half past nine/nine thirty.You should go to bed./It's time to go to bed.

It is nine o'ciock,it’s time to go to bed

it's already nine thirty, you should go to bed./you should go to sleep/ you should go and get some sleep.

It's half past nine.You should go to bed.