This question involved the plot and character setting of the novel. It needed to be answered according to the specific situation of the novel. However, generally speaking, in order to create a healthy fitness character, Zhang Tian 'ai might do some extreme actions, such as not sleeping for three days and three nights. However, this kind of behavior might not necessarily exist. It might just be an exaggerated description in the novel. In novels, the actions and decisions of the characters are often limited by the plot and theme, and cannot be exactly the same as in reality.