I often exercise, and I often sleep at one o'clock. This kind of life has lasted for two years now. According to my current situation, it has no effect on fitness. As long as I keep exercising, have a proper diet and enough sleep time, and occasionally stay up late, it has no effect on muscle tightening and body shaping. Fitness depends on persistence. Of course, the disadvantages of staying up late are needless to say. Although there is no impact in the short term, staying up late for a long time has buried health risks. It is recommended not to stay up late as much as possible.