First of all, if you want to get better, the first thing you have to do is of course to quit the habit of staying up late every day to play with your mobile phone. Many people probably find it difficult to quit this habit, but it is not difficult as long as you have the heart. I think there is a very good way. Put your mobile phone on your desk every night and read a particularly boring book before going to bed. If you can't stand it, you will want to sleep. As long as this persists for a period of time, the habit of not staying up late to play mobile phones will be formed.
The second step to getting better is exercise. You can go to the gym to exercise with the coach, or you can go home and set aside an hour for a walk outside every day, or go running in the track and field. If you keep exercising for a period of time like this, even if you stay up late for many nights, your body will gradually recover.
These are things that I think people who stay up too much can do to make their health worse, and then make their health better.