I have studied [Until after][1].
I understand until after means until after the end of the time frame or a period of time. 

 1. They didn’t reach until after night. 
 2. The sun doesn’t rise until after night.
 3. He refused to comment until after the trial.



In the first sentence, “after night” means **during** night, and in the second one, “after night” means after **the end of** night. 
In the third sentence, “after the trial” means also after **the end of** trial. 

Am I correct?
If so, what makes the differences in the meaning in the first and second sentences?

  [1]: https://ell.stackexchange.com/q/22389/72360