在老师的指导下，他决心克服睡懒觉的习惯。

原文英文

When Sima Guang was young, he was playful and loved sleeping in, which often led to scolding from his teacher and ridicule from his classmates. Under his teacher's patient guidance, he became determined to overcome his habit of oversleeping. In order to wake up early for studying, he once drank a large amount of water before going to bed, hoping it would force him to wake up the next morning. However, instead of waking up early, he ended up wetting the bed. Later, the clever Sima Guang came up with a solution by making a “warning pillow” out of a round piece of wood. Whenever he turned over in his sleep, his head would slip off the pillow onto the bed board, naturally waking him up. From then on, he got up early every day to study diligently. Through years of persistence, he eventually became a highly knowledgeable literary master and authored the famous historical work Zizhi Tongjian.