he saw the Prophet sleeping, while in the prostration position, until he snored or snorted. Then he stoodup to pray. So I said: "O Messenger of Allah! You were sleeping?" He said: "Wudu is not required except for sleeping while reclining. For when one reclines, joints relax."
Reference: Jami` at-Tirmidhi 77 In-book : Book 1, Hadith 77 English translation : Vol. 1, Book 1, Hadith 77
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