Musnad Abu Ya'la al-Mawsili 152:343

Abdullah ibn Amir ibn Zurarah, a Kufan, narrated to us, saying: Ibn Abi Za’idah narrated to us, from Hajjaj, from Fudayl, from Ibrahim, from Alqamah, from Abdullah: The Prophet, may Allah bless him and grant him peace, slept until he breathed heavily (snored), then he stood up and prayed. He (the narrator) said: So I mentioned it to Ata, and he said: "Indeed, the Prophet, may Allah bless him and grant him peace, was not like anyone else."