《宋史·列传·卷四》
死后，皇上追念不已，悲苦到天明不睡，作《思亡子诗》给近臣们看。
及薨，上追念不已，悲泣达旦不寐，作《思亡子诗》示近臣。
After he passed away, the emperor reminisced about him incessantly and was so grief-stricken that he stayed awake until the next morning. He wrote the "Mourning the Death of My Son" and showed it to close ministers.
<s>[INST] Convert the following modern Chinese text into Classical Chinese: 死后，皇上追念不已，悲苦到天明不睡，作《思亡子诗》给近臣们看。 [/INST] 及薨，上追念不已，悲泣达旦不寐，作《思亡子诗》示近臣。</s>
Convert the following modern Chinese text into Classical Chinese: 死后，皇上追念不已，悲苦到天明不睡，作《思亡子诗》给近臣们看。
user
及薨，上追念不已，悲泣达旦不寐，作《思亡子诗》示近臣。
assistant