I want to know, after staying up late tonight, will it affect my health check-up tomorrow morning? Urgent! Also, what are the taboos for getting a health certificate?

There are no taboos. A health certificate is only four or five tests. As long as your body is normal and your liver function is normal, there is generally no big problem. It is best not to stay up late, because staying up late may affect the blood samples taken the next day, resulting in inaccurate liver function tests. So it's best not to stay up late and go to bed early.