《资治通鉴·汉纪·汉纪三十六》
光武帝生前，每日早晨主持朝会，午后才散，屡屡召见卿、郎将讲说经书义理，到半夜才睡。
帝每旦视朝，日昃乃罢，数引公卿、郎将讲论经理，夜分乃寐。
During his lifetime, Emperor Guangwu presided over the morning court every day and did not adjourn until the afternoon. He repeatedly summoned Qing and Lang generals to expound on the meaning of the scriptures, and did not fall asleep until midnight.