见到过 late into the night 的用法。如：
The meeting went on late into the night.
We sang and dance until late into the night.
但今天看到一个 late at night 的用法：
If you are on campus in the evening or late at night, you can buy snacks, fast food, and drinks in the Lower Café located in the bottom level of the Douglas Centre. This area is often used for entertainment such as concerts, games or TV watching.
请问 late into the night 与 late at night 有区别吗？