Ibn 'Abbas said:

“Allah’s Messenger (ﷺ) slept until he gasped for breath, and he had gasped for breath while he was sleeping, so Bilal came to him and called him to the ritual prayer, whereupon he got up and performed the ritual prayer, and he did not perform the minor ritual ablution. And there is a story behind this tradition."

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.‏