What does it mean to excrete at eight o'clock and wake up at nine o'clock in Yu Qing Fei?

This stem comes from a joke. A man went to see a doctor and told him to excrete at eight o'clock every morning on time. The doctor said it was good and regular. Then the man said, but he doesn't get up until nine o'clock every morning. The point of this joke is that although this person excretes regularly, he always misses the best time to get up. As a singer, Yu-Ching Fei mainly sings and sometimes records variety shows. He often tells jokes on the show, so some netizens put this joke on his head and called him "Yu Qingfei who woke up at 9 o'clock after 8 o'clock".