How to evaluate the phenomenon of "4: 30 in the morning"?

I don't think this phenomenon should be too common. Learning is a part of life, a part of life, but I don't think that not learning doesn't mean you are a basket case. If you are tired from work or study at ordinary times, it is really fatal to get up at 4: 30 the next morning to continue your study, because in the long run, your spirit will remain depressed, and you may even lose your nerve.