Hadith 40
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ ابْنَ عُمَرَ، كَانَ يَنَامُ جَالِسًا ثُمَّ يُصَلِّي وَلاَ يَتَوَضَّأُ .
Yahya related to me from Malik from Nafithat Ibn Umar used to sleep sitting and then would pray without doing wudu
Mauquf Sahih (Salim al-Hilali)
Muwatta Malik 40 · Book 2, Hadith 9