I have studied Until after. I understand until after means until after the end of the time frame.

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?