It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to sleep in such a way that the sound of his snoring could be heard, then he would stand up and perform prayer without performing ablution. Ikrimah said: The Noble Prophet (peace and blessings be upon him) was protected.
Hadith Takhrij«اسناده صحيح۔ أخرجه البيھقي: 1/ 121، وحديث ابن عباس روي في المسند بالفاظ مختلفة ومطولة ومختصرة و منھا ما رواه الشيخان ، (انظر مسند أحمد ترقيم الرسالة: 2194 ترقیم بيت الأفكار الدولية: 2194»
Brief Explanation
Benefits: … The sleep of the Noble Prophet sallallahu alayhi wa sallam was not a nullifier of ablution (wudu) for him, because during sleep, the heart of the Prophet sallallahu alayhi wa sallam remained awake.