《旧唐书·本纪·卷十七》
等到即帝位之后，每次在延英殿召见宰相们议事，常常到深夜。
洎即位之后，每延英对宰臣，率漏下十一刻。
After succeeding to the throne, each time he summoned his prime ministers to discuss matters in Yanying Hall, it would often be late at night.