It is narrated from Hazrat Anas (may Allah be pleased with him) that once the time for prayer arrived, the Prophet (peace and blessings be upon him) was conversing in private with a man in the mosque. When the Prophet (peace and blessings be upon him) stood up for prayer, the people had fallen asleep.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11987