Simak bin Harb says: I asked Sayyiduna Jabir bin Samurah (may Allah be pleased with him) what the Prophet (peace and blessings be upon him) used to do after offering the Fajr prayer. He said: "He (peace and blessings be upon him) would remain sitting in his place until the sun rose."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1875