Our middle school teacher said that because human immunity recovers around 10- 12 at night, if you don't get a good rest at this time, your resistance will decline.

In addition, it may be related to your physical fitness. After all, everyone's routine is similar, so I think you'd better go to a regular hospital. Generally, the problem is not big. We are all young! :-D

By the way, on the question of health, Zhihu said:

To avoid delaying your illness, please go to a hospital or a professional institution for treatment. In Zhihu, only discussions in the fields of medicine, pathology and pharmacology that do not involve specific cases are allowed.