直到深夜 deep into the night ; late into the night ; till midnight ; till a late hour

一直迟到深夜 until late at night

一直到深夜 Until midnight ; until late at night ; Until very late last night

直到深夜才能睡着 To finally sleep at night

我们一直谈到深夜 we talked far into the night

他一直工作到深夜 he worked till midnight