Ash-Shama'il Al-Muhammadiyah, Book 38, Hadith 245 (English) ⓘ

Ibn 'Abbaas Radiyallahu 'Anhu reports: "Once Rasulullah Sallallahu 'Alayhi Wasallam slept and began snoring. It was, the nature of Rasulullah Sallallahu 'Alayhi Wasallam that he snored, when he slept. Bilaal Radiyallahu 'Anhu gave the call to prepare for salaah. Rasulullah Sallallahu 'Alayhi Wasallam awakened and performed the salaah. He did not perform the wudu". This hadith has a detailed incident

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ‏:‏ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، قَالَ‏:‏ حَدَّثَنَا سُفْيَانُ، عَنْ سَلَمَةَ بْنِ كُهَيلٍ، عَنْ كُرَيْبٍ، عَنِ ابْنِ عَبَّاسٍ‏:‏ أَنَّ رَسُولَ اللهِ صلى الله عليه وسلم، نَامَ حَتَّى نَفَخَ، وَكَانَ إِذَا نَامَ نَفَخَ، فَأَتَاهُ بِلالٌ فَآذَنَهُ بِالصَّلاةِ، فَقَامَ وَصَلَّى وَلَمْ يَتَوَضَّأْ وَفِي الْحَدِيثِ قِصَّةٌ‏.‏