Shama'il Muhammadiyah #249

Ibn 'Abbas said: “Allah’s Messenger (Allah bless him and give him peace) 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."