Chapter 344 suggests that Jing Rui and Xiao Qi begin to feel sleepy at 10 o'clock.

Mubai saw that the eyes of the two little guys had been scattered, sitting on the sofa with little heads, as if he could fall asleep at any time. It was funny and distressed. He offered to break up the meal. "Okay, the meal is over, it's almost time to go back to rest. The two little guys are going to go to school tomorrow."

"The child..." Su Su took Xiao Qi from Mubai, who had been sleeping soundly. Xiao Qi was held horizontally by Mubai. Don't sleep too well with his mouth open...