Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) was sleeping lying on his back, and he began to snore. Then he got up and prayed, and he did not perform ablution again. (Allamah al-Haythami says:) I say:
Ibn Majah recorded it, except that he did not record the words: "lying on his back."
Abu Ya'la and al-Bazzar recorded it, and he recorded these words: "He fell asleep while in prostration." The narrators of Abu Ya'la are the narrators of the Sahih.